It was thought that only proteins could catalyse reactions in cells.过去曾认为只有蛋白质才能催化细胞内的反应。DNA is the genetic material inside every cell that carries the blueprints for everything from hair color to the risk of cancer.脱氧核糖核酸是存在于每个细胞内的基因物质，它承载从头发颜色到致癌风险等各种遗传型板。