植物血凝素(PHA)是从红小豆中提取的化合物,在T淋巴细胞膜上有其天然受体,它可促T淋巴细胞转化为淋巴母细胞。双链酶是链球菌体内含有的链激酶和链导酶(SK-SD),结核菌素是结核菌体之细胞蛋白抗原成份。一般人多已接触过此类菌,即均已使T淋巴细胞致敏。若将一定量的抗原注入人体皮内,可引 Phytohemagglutinin (PHA) is a compound extracted from adzuki beans and has its natural receptor on the membrane of T lymphocytes, which promotes the conversion of T lymphocytes into lymphoblasts. The double-stranded enzyme is streptokinase and streptokinase (SK-SD) contained in Streptococcus, and tuberculin is a cellular protein antigen component of tuberculosis bacteria. Most people have been exposed to such bacteria, that have been T lymphocytes sensitized. If a certain amount of antigen injected into the human skin can be cited