The liquid that comes out of a piece of freshly-cooked steak is actually water mixed with myoglobin. Myoglobin is a protein that’s rich in iron that turns red when exposed to oxygen. All proteins, ...

This article was reviewed by Darragh O’Carroll, MD. PSA and Testosterone: Are They Linked? Prostate-specific antigen (PSA) is a term you’ll probably become familiar with once you start getting ...

Prostate-specific antigen (PSA) is a protein produced by both normal and cancerous cells in the prostate gland. It is primarily measured through a blood test, where normal levels are typically found ...