To understand how cells multiply out of control and form tumors, scientists have long focused on proteins that regulate cell growth.But another type of molecule is muscling its way into the field.

• 为了了解细胞是如何失去控制地倍数繁殖而形成肿瘤，科学家们已长期关注在调节细胞生长的蛋白质分子，不过另一类型的分子正试着挤身进入这个领域。