Their functions range from enzymes and hormones to electron-transfer molecules, contractile elements, and important genetic elements such as the histones that coat DNA in eukaryotic chromosomes.

• 他们的功能很多，像酶、激素、电子传递分子，与收缩性有关的物质、以及重要的遗传物质，如在真核生物染色体中与DNA结合的组蛋白。