The type of chemical reaction that causes this loss of elasticity is one that results in a chemical bond ( a cross - link ) between two nearby proteins that were previously able to slide across or along each other 引起这种弹性丧失的化学反应类型,是在本来能横向滑动或彼此并排的相邻两个蛋白质之间产生一种化学键(交联键) 。