The portion with strongest antigenity had a molecular weight of 37 000.Both this portion of PS and VSGP could react on the sera of patients with rheumatic valvulitis.

• 其中最具抗原性的部分是37000，37000的多糖部分和牛心瓣膜糖蛋白能同时与风湿性心瓣膜炎的血清发生免疫反应。