作者:于琦/薛超然
美工:何国红/罗真真
排版:马超
▶ 引言
兔单克隆抗体凭借其独特的免疫应答优势,已成为抗体药物研发版图中的核心力量。相比传统的鼠单抗,兔单抗普遍展现出更高的亲和力、更强的检测灵敏度,尤其在识别人类抗原时,能够触及鼠单抗无法识别的隐蔽表位,显著拓宽了抗体药物的应用范围。凭借这些卓越性能,兔单抗在科研探索、临床诊断及治疗干预领域正发挥着不可替代的作用。
依托这一核心优势,三优生物深度融合SAI-DA(三优智能新药加速器),正式推出基于“全程智能”架构的兔单抗定制服务平台。该平台通过整合全自动液体处理系统、AI驱动的克隆筛选流程及数字化项目管理中枢,实现了从免疫到筛选的全链条智能化跃升。在此基础上,三优生物针对治疗、诊断、检测、科研四大核心应用场景,专项部署了适配性人工智能模块。这一系列场景导向的智能化布局,致力于为全球研究者提供高性能、高成功率、高可及性的抗体解决方案,助力创新成功加速落地。
一、平台背景
近年来,全球抗体发现市场持续扩张,2023年市场规模已达数十亿至百亿美元量级,其中基于动物免疫的技术路线稳居核心地位,兔、小鼠、羊驼等模型被广泛应用。兔免疫平台因其亲和力高、多样性丰富且易于人源化而逐步成为主流选择。自2019年首个治疗性兔单抗药物Brolucizumab获批上市以来,兔源抗体的临床转化进程显著加速。凭借有效识别保守抗原或难成药靶点的能力,兔单抗被视为开发新一代疗法的关键武器,目前多个候选药物已进入临床阶段,应用前景广阔。
三优生物以前瞻性的技术视野,率先完成自动化设备矩阵的全面部署,系统性实现“全程智能”运营模式,以此为核心驱动,打造新一代抗体发现与优化平台,致力于成为行业智能化转型的标杆。通过深度融合自动化硬件与人工智能决策引擎,三优生物推动从文库构建到应用开发的全链条智能化升级,显著缩短研发周期,赋能治疗、诊断、检测与科研等多元化应用场景,力争将抗体筛选周期压缩至14天以内,抢占技术创新制高点。这一突破性进展,标志着三优生物在动物免疫抗体发现领域迈入了全新阶段。未来,“全程智能”兔免疫抗体库发现平台将持续推动针对难成药靶点的高稳定性抗体药物开发进程,加速创新成果向临床价值的转化。
二、平台特性
01
特性一:抗体谱更广泛
兔抗在开发针对弱免疫原性抗原(如小分子和半抗原)的抗体方面具有独特优势,尤其能够识别鼠单抗难以识别的抗原表位。这一优势主要源于兔抗体生成过程中独特的多样性发生机制和高效的免疫应答体系。首先,兔子在抗原刺激后能够产生更强的免疫应答反应,为后续的抗体筛选奠定了坚实基础。其次,在抗体生成过程中,兔不仅通过体细胞超突变和基因重排形成丰富的VJ和VDJ抗体谱系,更拥有一套独特的基因转换机制:在V(D)J重排完成后,兔子可以利用体内大量存在的上游“假基因”(Pseudogenes)作为供体,将这些假基因的序列片段“剪贴”到已重排的V区基因上,从而在极短时间内产生巨大的序列多样性。这一机制显著拓展了抗体的表位识别丰度,使其能够覆盖鼠单抗的识别盲区,为攻克高难度靶点提供了丰富的分子弹药库。
▲ Fig. 1 V(D)J rearrangement
02
特性二:结构更简单
兔免疫球蛋白的结构相对简单,仅包含四种类型(不含有IgD),且兔IgG不进一步划分亚类,这种简化的结构为后续的分子工程操作提供了极大便利。在分子结构层面,相较于小鼠和人的IgG,兔IgG在其重链N末端及D-E环区域通常拥有更少的氨基酸残基,同时在可变区内存在一个额外的二硫键,这些结构特征共同赋予了兔单抗更高的分子稳定性和构象刚性,为其在严苛条件下的功能表现提供了结构保障。
▲ Fig. 2 Schematic diagram of antibody structure
03
特性三:易于人源化
兔源抗体在治疗性抗体开发中展现出多重优势。尽管兔源和鼠源抗体的可变区序列与人类同源性相似,通常维持在70%至80%之间,但兔子的VH基因家族构成极为单一,主要归属于VH1家族,而小鼠的V基因家族则更为多样和杂乱。得益于兔抗体框架区序列的高度一致性,三优生物已成功开发出一套通用且成熟的“人类框架模板”体系,用于高效承载兔抗体的CDR环,显著降低了人源化改造的技术门槛与试错成本。
此外,抗体的稳定性在很大程度上依赖于重链(VH)与轻链(VL)交界区域的疏水相互作用。兔抗体在这些关键氨基酸位点上,往往比鼠抗体更易于适配人类的VH/VL组装模式。这意味着在进行骨架替换后,兔抗体的抗原识别口袋(Pocket)能够更好地保持其原有的拓扑结构,不易发生构象漂移,从而有效维持抗体的结合活性和稳定性。
▲ Fig. 3 Schematic of natural rabbit antibodies in IgG format
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特性四:亲和力更高
兔在抗体亲和力成熟方面具备显著的进化优势。其不仅拥有庞大的B细胞反应库,能够产生高度多样化的抗体谱系,同时在免疫系统的亲和力优化机制上,也比小鼠及其他啮齿动物更为高效。在抗体结构层面,兔的重链CDR3区域长度变化范围大,普遍长于小鼠。更长的CDR3意味着能够形成更为复杂的空间构象,使其更易于深入抗原表面隐蔽的“缝隙”或“口袋”结构,从而识别更为独特的抗原表位。
更为关键的是,兔B细胞在淋巴滤泡中进行的体细胞高频突变不仅发生频率高,突变覆盖的序列范围也较小鼠更为广泛。这一机制使得兔抗体在亲和力成熟方面表现突出,往往可达到鼠抗体的10至100倍,显著提升了抗体的靶向精度与功能效力。
▲ Fig. 4 Schematic diagram of antigenic epitopes
三、平台优势
01
优势一:AI驱动靶点智能分析,遴选最佳原材料方案
三优生物依托全程智能技术体系,针对不同靶点开展深度智能分析,在免疫启动前即通过对靶点的结构特征、物种同源性及免疫原性进行多维智能评估,预判其可开发性,从源头上规避不可行或高风险靶点的资源投入,大幅度提升研发效率与成功率。针对“难攻克”靶点的表达局限,三优生物可灵活提供多种抗原形式和多种表达系统,大幅提升针对复杂靶点成功获取功能性抗体的概率。
▲ Fig. 5 Diverse types of targets
02
优势二:AI赋能“一键式”智能建库,文库库容大多样性高
三优兔免疫抗体发现平台依托“全程智能”策略,深度集成自动化液体处理工作站,实现了从VH/VL扩增、磁珠纯化到文库电转的全流程标准化操作。通过消除人工移液误差,该平台确保兔抗体特有的长CDR3区域多样性得到完整保留,并将建库周期缩短至传统的1/3。在保障文库极高均一性的同时,突破了物理通量瓶颈,为下游高亲和力功能分子的高效筛选提供了高质量的原始文库储备。
▲ Fig. 6 Intelligent database construction schematic diagram
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优势三:AI驱动高通量自动化海选,数字化筛选重构发现路径
三优生物通过集成先进的自动化海选系统,实现了固相与液相筛选的自动化标准化操作。该系统无缝衔接三代测序技术,利用AI深度学习序列分析算法,对分子丰度进行深度挖掘与多维聚类。通过建立科学的富集评估模型,将高频富集的分子直接定义为阳性克隆,彻底颠覆了传统单克隆挑选与ELISA鉴定的低通量模式。这一AI数字筛选策略,不仅大幅提升了候选分子的覆盖深度与多样性捕获能力,更确保了筛选过程的客观性、可重复性与超高通量,使稀有阳性克隆的发现成为常态。
▲ Fig. 7 High-throughput automated equipment involved
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优势四:AI成药性预测模型,构建分子全维度画像
针对筛选出的候选分子,平台集成AI深度分析矩阵,实现分子成药性的全方位预判与精准画像:通过对 CDR 长度分布、序列差异及 PTM(翻译后修饰)位点进行精密扫描,排除高风险分子;进行AI三维结构建模,开展斑块分析(Patch Analysis)与表位制图(Epitope Mapping),可视化解析分子-抗原相互作用模式;结合免疫原性预测算法,在分子发现早期即完成免疫原性风险预演。通过多维度数据融合,生成候选分子的完整数字画像,确保交付分子不仅具备优异的亲和力,更拥有卓越的生物稳定性、高溶解性和低非特异性结合风险。这一数字化闭环极大地提升了发现通量与决策精准度,为临床前开发提供了高质量的候选分子入口。
▲ Fig. 8 Wide range of application scenarios
四、案例汇总
平台历年建库数量如柱状图所示,在2023至2025年的平台建设期内,三优生物已经完成83个兔免疫抗体库构建,覆盖多种靶点类型与难度等级。
▲ Fig. 9 Statistical overview of rabbit immune library projects over the years
针对Target A至Target E五个不同靶点,筛选出的Unique序列数量稳定在50-300之间。随着靶点复杂度的变化,AI驱动筛选系统展现出强大的分子富集能力,单项目最高可获得282个独特候选序列,为后续功能验证与药物开发提供了极为丰富的种子分子储备。
▲ Fig. 10 Unique clone screening statistics for rabbit immune library
五、代表案例
01
抗CDH17抗体产生
基本信息:CDH17(Cadherin-17,钙黏蛋白17)是钙黏蛋白家族中的一种新成员。其结构包括七个胞外钙黏蛋白重复结构域、一个单次跨膜结构域以及一个短的胞质结构域。在多种常见的胃肠道肿瘤,如结直肠癌、胃癌和神经内分泌肿瘤中,CDH17的表达与患者的不良预后及肿瘤转移密切相关,因此被视为一个有潜力的肿瘤治疗靶点。值得注意的是,靶向CDH17的CAR-T疗法相较于其他同类靶点的治疗手段表现出更优的安全性。该疗法能有效杀伤CDH17阳性的肿瘤细胞,而对同样表达CDH17的正常肠上皮细胞无明显毒性。这一特点使CDH17成为一个较安全且极具潜力的实体瘤治疗靶点。
竞争格局:针对CDH17抗体药物,两款处于临床一期,分别为ARB202(CDH17/CD3)和Boehringer Ingelheim(CDH17/TRAILR2),ARB202临床前GLP安全性良好,并证明不结合正常结直肠组织;针对CDH17-CART目前临床前证明安全性,已经进行临床一期。因此,开发针对CDH17靶向药物机制明确,安全性良好。
药物MOA:利用其在消化道肿瘤的高特异性表达作为“定位锚”,桥连CD3招募并激活T细胞,或强力交联TRAILR2/DR5触发肿瘤细胞凋亡,同时规避系统性毒性。
02
抗CDH17抗体关键结果
2.1. 蛋白水平的结合活性分析
通过三优兔免疫抗体库筛选获得的抗体候选分子大多具有较好的蛋白水平结合活性。如图11展示了采用ELISA分析候选抗体与抗原的亲和力测定结果,其中全部候选抗体的亲和力水平与对照抗体相当。
Fig. 11 Binding affinity determination by ELISA
2.2. 细胞水平的结合活性分析
通过三优兔免疫抗体库筛选获得的抗体候选分子大多具有较好的细胞水平结合活性。如图12展示了采用FACS分析候选抗体与过表达细胞的亲和力测定结果,其中全部候选抗体的亲和力水平与对照抗体相当。
Fig. 12 Binding affinity determination by FACS
六、总结展望
兔免疫抗体凭借其独特的表位识别广度、卓越的结合亲和力及高度精准的靶向能力,正从一项“差异化技术”演进为生物医药领域的“主流平台”,尤其在应对难成药靶点、高灵敏度诊断及复杂检测场景中展现出不可替代的战略价值。三优生物依托行业领先的兔免疫抗体发现平台,通过整合天然免疫优势与高效人源化改造技术,系统性突破传统杂交瘤的技术边界,在GPCR、离子通道等高难度靶点领域持续展现技术优势。
面向未来,三优生物以“场景化驱动”与“全程智能化”为战略双核,全面推动抗体发现流程的智能化重构,从靶点分析、表位预测到分子优化,全程嵌入AI决策引擎,实现数据驱动的精准设计与高效验证,全面提升平台效能,打造具有全球竞争力的智能化品牌形象。通过与全球头部制药企业及顶尖科研机构的深度合作,三优生物将持续助力行业跨越从差异化表位发现到临床高效转化的鸿沟,加速精准医疗发展进程,致力成为抗体发现领域全程智能化转型的领跑者。
AI-STAL 2.0 | A Full-Process Intelligent Solution for Rabbit Monoclonal Antibody Generation
▶ Introduction
Rabbit monoclonal antibodies (RabMAbs) have become an important modality in antibody discovery because of their distinctive immune response. Compared with conventional murine monoclonal antibodies, RabMAbs typically offer higher affinity and greater detection sensitivity. When immunized against human antigens, they can also recognize conserved or cryptic epitopes that may be poorly immunogenic in mice, expanding the range of addressable targets. These properties make RabMAbs valuable across research, diagnostics, analytical testing, and therapeutic development.
Building on these advantages, Sanyou Bio has integrated SAI-DA (Sanyou AI-Drug Accelerator) and launched a customized RabMAb discovery platform based on a "Full-Process Intelligence" architecture. The platform combines automated liquid handling, AI-assisted clone screening, and digital project management to connect immunization, library construction, screening, and candidate assessment in a single intelligent workflow. Application-specific AI modules support four major downstream applications: therapeutics, diagnostics, testing, and research. The goal is to deliver high-performance, reliable, and accessible antibody solutions while accelerating the translation of promising ideas into practical outcomes.
I. Platform Background
The global antibody discovery market has continued to expand, reaching the multibillion-dollar range by 2023. Animal immunization remains a central discovery route, with rabbit, mouse, and alpaca models widely used. Rabbit immunization platforms are increasingly favored for their high-affinity responses, broad repertoire diversity, and suitability for humanization. Since the approval of brolucizumab, the first marketed rabbit-derived therapeutic antibody, in 2019, clinical translation of rabbit-derived antibodies has accelerated. Their ability to recognize highly conserved antigens and other challenging targets makes RabMAbs an important source of next-generation therapeutic candidates, several of which have advanced into clinical development.
Sanyou Bio has established an integrated automation infrastructure and a systematic "Full-Process Intelligence" operating model to support next-generation antibody discovery and optimization. By combining automated hardware with AI-enabled decision support, the platform upgrades the full workflow from library construction through application development, shortening development cycles across therapeutics, diagnostics, testing, and research. The platform is designed to reduce antibody screening timelines to as short as 14 days. This integrated approach marks a new stage in animal immunization-based antibody discovery and is intended to accelerate the development of stable, high-quality antibodies against challenging targets and their translation into clinically relevant candidates.
II. Platform Features
01
Feature 1: Broader Epitope Coverage and Repertoire Diversity
Rabbit antibodies are particularly well suited to weakly immunogenic antigens, including small molecules and haptens, and can recognize epitopes that are difficult to access with murine antibodies. This advantage arises from both a strong immune response and distinctive mechanisms of antibody diversification. In addition to VJ/VDJ recombination and somatic hypermutation, rabbits use gene conversion: sequence segments from upstream pseudogenes are introduced into rearranged V-region genes. This process rapidly expands sequence diversity and broadens epitope coverage, providing a rich molecular starting pool for difficult targets.
▲ Fig. 1 V(D)J rearrangement
02
Feature 2: Streamlined Structure and High Stability
Rabbit immunoglobulins have a relatively streamlined architecture, comprising four isotypes and lacking IgD; rabbit IgG is also not subdivided into subclasses. This simplicity facilitates downstream molecular engineering. Compared with mouse and human IgG, rabbit IgG generally contains fewer amino acid residues at the heavy-chain N-terminus and in the D-E loop, together with an additional disulfide bond in the variable region. These structural features contribute to molecular stability and conformational rigidity, supporting robust performance under demanding conditions.
▲ Fig. 2 Schematic diagram of antibody structure
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Feature 3: More Straightforward Humanization
Rabbit-derived antibodies offer practical advantages for therapeutic humanization. Although rabbit and murine antibody variable regions show broadly similar sequence identity to human antibodies, typically around 70%-80%, the rabbit VH repertoire is comparatively homogeneous and is dominated by the VH1 family. In contrast, murine V-gene families are more heterogeneous. The high framework consistency of rabbit antibodies has enabled Sanyou Bio to establish a mature set of human acceptor-framework templates for rabbit CDR grafting, reducing the complexity and iteration required during humanization.
Antibody stability also depends strongly on hydrophobic packing at the VH/VL interface. At several key interface positions, rabbit antibodies are often more compatible with human VH/VL assembly than murine antibodies. Following framework grafting, the antigen-binding site can therefore be more readily preserved, reducing conformational drift and helping maintain both binding activity and molecular stability.
▲ Fig. 3 Schematic of natural rabbit antibodies in IgG format
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Feature 4: Higher Affinity and Access to Recessed Epitopes
Rabbits possess a large B-cell repertoire and highly efficient affinity-maturation mechanisms. Their heavy-chain CDR3 loops also show broad length diversity and are generally longer than those of mice. Longer HCDR3 loops can form complex three-dimensional conformations that reach recessed clefts or pockets on antigen surfaces, enabling recognition of distinctive epitopes.
Somatic hypermutation in rabbit B cells occurs at high frequency and can span a broader sequence range than in mice. This supports efficient affinity maturation; in some cases, rabbit antibodies can achieve affinities 10- to 100-fold higher than comparable murine antibodies, improving target recognition and functional potency.
▲ Fig. 4 Schematic diagram of antigenic epitopes
III. Platform Advantages
01
Advantage 1: AI-Guided Target Assessment and Antigen Design
Before immunization, Sanyou Bio applies multidimensional analysis to assess target structure, cross-species homology, immunogenicity, and overall developability. This enables feasibility risks to be identified early and helps avoid unnecessary investment in unsuitable or high-risk targets. For targets with challenging expression characteristics, the platform can deploy multiple antigen formats and expression systems, increasing the likelihood of generating functional antibodies against complex targets.
▲ Fig. 5 Diverse types of targets
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Advantage 2: AI-Enabled "One-Click" Library Construction with High Capacity and Diversity
Built on the "Full-Process Intelligence" strategy, the Sanyou rabbit immune antibody discovery platform integrates automated liquid-handling workstations across the complete library-construction workflow, from VH/VL amplification and magnetic-bead purification to library electroporation. Reducing manual pipetting variability helps preserve the characteristic long-CDR3 diversity of rabbit antibodies and shortens library construction to approximately one-third of the time required by conventional workflows. The result is a highly uniform, large-capacity starting library for efficient downstream identification of high-affinity functional molecules.
▲ Fig. 6 Intelligent database construction schematic diagram
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Advantage 3: AI-Driven High-Throughput Panning and Digital Screening
Sanyou Bio has integrated automated panning systems for standardized solid-phase and solution-phase screening. The workflow is connected with third-generation sequencing and AI-based sequence analysis to quantify molecular abundance and perform multidimensional clustering. Enrichment models prioritize highly enriched sequences as putative positive clones, reducing dependence on traditional low-throughput clone picking and ELISA prescreening. This digital strategy expands sequence coverage, improves capture of molecular diversity, and enhances the objectivity, reproducibility, and throughput of screening, including the identification of rare positive clones.
▲ Fig. 7 High-throughput automated equipment involved
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Advantage 4: AI-Based Developability Profiling
For each screened candidate, the platform integrates multiple AI-assisted analyses to build a comprehensive developability profile. CDR length, sequence liabilities, and potential PTM sites are assessed to flag high-risk molecules. AI-based three-dimensional modeling, surface-patch analysis, and epitope mapping are used to interpret antibody-antigen interactions, while immunogenicity prediction supports early risk assessment. By integrating these data, the platform generates a digital profile for each candidate, prioritizing molecules with strong affinity, favorable stability and solubility, and a low risk of nonspecific binding. This closed-loop workflow improves screening throughput and decision quality and provides a stronger pool of candidates for preclinical development.
▲ Fig. 8 Wide range of application scenarios
IV. Platform Track Record
As shown in the chart, Sanyou Bio successfully constructed 83 rabbit immune antibody libraries during the platform’s initial build-up phase (2023–2025), spanning a diverse range of target types and technical complexities.
▲ Fig. 9 Statistical overview of rabbit immune library projects over the years
Across five representative targets (Targets A-E), each project yielded approximately 50-300 unique sequences. Despite differences in target complexity, the AI-driven screening workflow consistently demonstrated strong enrichment capacity, with up to 282 unique candidate sequences identified in a single project. This provides a broad seed-molecule pool for subsequent functional validation and drug development.
▲ Fig. 10 Unique clone screening statistics for rabbit immune library
V. Representative Case Study
01
Anti-CDH17 Antibody Discovery
Basic Information: CDH17 (cadherin-17) is a member of the cadherin family. It contains seven extracellular cadherin repeats, a single transmembrane domain, and a short cytoplasmic domain. CDH17 is expressed in several gastrointestinal malignancies, including colorectal cancer, gastric cancer, and neuroendocrine tumors, where elevated expression has been associated with tumor metastasis and poor prognosis. Preclinical studies of CDH17-directed CAR-T cells suggest a differentiated safety profile: the cells can eliminate CDH17-positive tumor cells while sparing normal intestinal epithelial cells that also express CDH17. These findings support CDH17 as a promising target for solid-tumor therapy.
Competitive Landscape: Two CDH17-targeted antibody programs have entered Phase I clinical development: ARB202 (CDH17/CD3) and a Boehringer Ingelheim CDH17/TRAILR2 candidate. ARB202 demonstrated a favorable GLP toxicology profile in preclinical studies and was reported not to bind normal colorectal tissue. CDH17-directed CAR-T programs have also progressed into Phase I following encouraging preclinical safety findings. Together, these programs provide clinical and mechanistic validation for CDH17 as a therapeutic target.
Mechanism of Action: Leveraging the highly tumor-specific expression of CDH17 in gastrointestinal cancers as a "targeting anchor," the molecule either bridges CD3 to recruit and activate T cells, or hyper-crosslinks TRAILR2/DR5 to trigger tumor cell apoptosis, while effectively avoiding systemic toxicity.
02
Key Results for Anti-CDH17 Antibodies
2.1. Protein-Level Binding Activity
Most candidate antibodies generated from the Sanyou rabbit immune antibody library showed strong protein-level binding. Figure 11 summarizes ELISA binding results, with all tested candidates performing comparably to the benchmark antibody.
Fig. 11 Binding affinity determination by ELISA
2.2. Cell-Level Binding Activity
Most candidate antibodies also showed strong cell-surface binding. Figure 12 summarizes flow-cytometry results using antigen-overexpressing cells, with all tested candidates performing comparably to the benchmark antibody.
Fig. 12 Binding affinity determination by FACS
VI. Summary and Outlook
With broad epitope recognition, high binding affinity, and precise target engagement, rabbit-derived antibodies are moving from a differentiated option toward a mainstream discovery platform in biopharmaceutical R&D. They offer particular value for challenging targets, high-sensitivity diagnostics, and complex assay development. By combining the natural advantages of the rabbit immune system with efficient humanization engineering, Sanyou Bio's rabbit immune antibody discovery platform extends beyond the limitations of conventional hybridoma workflows and has demonstrated particular strengths for GPCRs, ion channels, and other technically demanding target classes.
Looking ahead, Sanyou Bio will continue to advance a strategy centered on application-driven design and "Full-Process Intelligence." AI-enabled decision support will be embedded throughout target assessment, epitope prediction, molecular screening, and optimization to support data-driven design and efficient experimental validation. Through continued collaboration with leading pharmaceutical companies and research institutions worldwide, Sanyou Bio aims to bridge the gap between differentiated epitope discovery and efficient clinical translation, accelerate precision medicine, and help lead the intelligent transformation of antibody discovery.
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