绪言转移因子(TF)是从免疫的供体转移皮肤敏感性到非免疫受体的可透析的白细胞提取物(DLE)中发现的一种成分。人类TF有一个核糖化的肽结构,似乎对于供体的反应性是特异性的。部分由于从人类一源获得的TF的数量和特异性的限制,在人类进行结构,机制和特异性的试验是困难的。以牛作为TF来源能克服应用人类供体的某些限制。牛TF(BTF)能在受体中和包括恒可猴在内的其它种属中刺激特异性的迟发型敏感 Introduction Transfer Factor (TF) is a component found in dialysed leukocyte extracts (DLEs) that transfer skin sensitivity from immunized donors to non-immune receptors. Human TF has a ribosylated peptide structure that appears to be specific to the donor’s reactivity. Partly because of the number and specificity of TFs obtained from a human source, it is difficult, in part, to carry out structural, mechanistic and specific tests in humans. Using cattle as TF sources overcomes some of the limitations of applying human donors. Cattle TF (BTF) is able to stimulate specific late-onset sensitivities in receptors and other species including Procambarus