something, for example a gene or substance, that shows that a particular biological process or condition is present

The Johns Hopkins team have identified a genetic change, or biomarker, that can be measured in the blood of colon cancer patients. 约翰Ÿ霍普金斯大学的团队已经确定了一种可以在结肠癌患者的血液中检测到的基因变化，也称生物标志物。