Llama, camels, and alpacas are camelids that produce normal IgG1 like antibodies and also functional IgG isotypes that do not incorporate light chains and possess only heavy chains. These heavy-chain antibodies may constitute about 50% of the IgG in llama serum and as much as 75% of the IgG in camel serum. By virtue of their smaller size they exhibit better bio-distribution, tissue penetration, and monomeric behavior. IgG2 consists of dimers of short heavy chains, which are characterized by a normal Fc region without a CH1 domain. Although it lacks the CH1 region, it still retains an antigen binding domain called the VHH region. Clone 19D8 is shown to specifically bind to three discrete IgG2 isotypes, designated as a, b, and c, in Llama. (Ref.: Daley, LP., et al. (2005). Clin. Diag. Lab. Immunol. 12(4); 380-386).，官网链接：https://www.sigmaaldrich.cn/product/mm/mac507 默克 科研、开发、生产。 作为生命科学行业的全球领先供应商，我们致力于为科研、生物技术开发和生产，以及制药药物疗法开发和生产提供各类解决方案和服务。

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