1963年Osoba等将装有初生动物胸腺的扩散盒植入摘除胸腺的动物腹腔内,可使动物的免疫功能恢复。这一实验提示胸腺分泌体液因子的作用。迄今为止,用不同方法已从胸腺中提取出多种生物活性物质。其中受到重视,目前研究较多的主要是胸腺素。称为胸腺素组分5的小牛胸腺部分纯化提取物 In 1963, Osoba et al. Placed the diffusion box containing the thymus of the protozoan into the peritoneal cavity of the thymus-removed animal and restored the immune function of the animal. This experiment suggests that the thymus secretes humoral factors. To date, various bioactive substances have been extracted from the thymus by different methods. Among them, attention has been paid to the fact that the main study is mainly thymosin. Calf thymus partial purified extract, called thymosin component 5