Iron in biology

Iron in hemoglobin is the source of the red coloration of vertebrate blood.
Hemoglobin diagram

Iron is an important biological element.[1][2][3] It is used in both the ubiquitous iron-sulfur proteins[1] and in vertebrates it is used in hemoglobin which is essential for blood and oxygen transport.[4]

  1. ^ a b Cite error: The named reference lpi was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference dlouhy-2013a was invoked but never defined (see the help page).
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  4. ^ Cite error: The named reference maton-1993a was invoked but never defined (see the help page).