A newborn baby's weight is one of the main markers used to determine how successfully they are breastfeeding. (ohbabynutrition.com)
Ionizing stars are one of the main markers of the spiral arms. (galaxymap.org)
In the sample results below, the patient has a high level of HPHPA, but a low level of 4 - Cresol, the main marker for C. difficile. (greatplainslaboratory.com)