A homogenous, acellular material similar to fibrin, found normally in the placenta and formed in connective tissue and in the walls of blood vessels in certain disease states.

• 类纤维蛋白一种均质、非细胞组成、类似于纤维蛋白的物质，通常在胎盘中可见，在连接的组织及某些疾病状态下的血管壁内形成