proteocephaloid

例句：

1. 1.The proteocephaloid structure of the virus is a key to its virulence.
   病毒的蛋白质外壳结构是其致病性的关键。
2. 2.The proteocephaloid layer is responsible for protecting the cell from external threats.
   蛋白质外壳层负责保护细胞免受外部威胁。
3. 3.The proteocephaloid membrane is a vital component of the cell's outer layer.
   蛋白质外壳膜是细胞外层的组成部分。