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Hemoglobin is a protein comprised of 4 polypeptide chains, each attached to a heme group composed of porphyrin and an iron atom.

Hemoglobin is a protein comprised of 4 polypeptide chains, each attached to a heme group composed of porphyrin and an iron atom.
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Caption:
Hemoglobin is a protein comprised of 4 polypeptide chains, each attached to a heme group composed of porphyrin and an iron atom.
Credit:
Album / Universal Images Group / Encyclopaedia Britannica
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Image size:
2550 x 2237 px | 16.3 MB
Print size:
21.6 x 18.9 cm | 8.5 x 7.5 in (300 dpi)