The collagen in the serosa is made up of a triple helix molecular structure 绒毛膜上的胶原组成了三角形的落选分子结构。
2.
The collagen found in serosa has a molecular make - up that is designed to withstand the stretching and contraction of the intestine 绒毛膜上的胶原是以分子形式聚合，从而承受住肠子的拉伸和收缩。
