The renal or kidney medulla is the inner part of the kidney. The medulla helps regulate the concentration of urine by filtering out water, salts, and acid. The National Institute of Diabetes and ...
The medulla region of a human thymus from a 1-year-old patient, showing epithelial cells (cyan and yellow), fibronectin, a protein of the extracellular matrix (magenta), and Polykeratin stem cells are ...