Hemoglobin diamond

A red blood cell contains over 250 million hemoglobin complexes. Hemoglobin is an iron-containing metalloprotein composed of four protein chains containing a ring-like heme group. Hemoglobin transports oxygen from the lungs to the rest of the body by reversibly binding oxygen to the iron in each heme.

exquisite colors by chain util.mroll 1, 180, 1 X-RAY DIFFRACTION 1.50 Å BakR d0mains rbc.diamond limited 5 eds. only ever minted