Cytokinins are often purine derivatives: e.g. kinetin (6-furfuryl aminopurine), an artificial cytokinin commonly used in experiments to promote cell division in tissue cultures;

• 细胞分裂素是嘌呤的衍生物，如激动素（6-呋喃氨基嘌呤），人工合成的细胞分裂素常用在组织培养中以促进细胞分裂。