英语语法分析

The scrapie agent in sheep may be similar to viroids.

绵羊的搔痒病因子可能也是类病毒。

However, the prion protein in scrapie-infected brain tissue differs from normal prion protein in some of its properties.

然而，在感染羊瘙痒病的大脑组织的普利昂蛋白在某些性质上不同于一般的普利昂蛋白。

Prions cause a number of fatal diseases such as mad cow disease in cattle, scrapie in sheep and kuru and Creutzfeldt-Jakob disease (CJD) in humans.

朊病毒是一种畸形的蛋白质，导致一些致命的疾病：如疯牛病，羊痒病，人类库鲁和克雅氏病(CJD, vCJD)。