It begins with plastic beads coated with an amine group.The carboxyl group on the first building block forms an amide bond with one of the amines, fixing the building block to a bead.

• 这个方法一开始将塑胶珠裹上一层胺基，然后让第一个基本组件的羧基与珠上的胺基键结，于是组件可固定在塑胶珠上。