Heme
<blockquote>
<p>Heme, or haem (spelling differences) is a substance precursive to hemoglobin, which is necessary to bind oxygen in the bloodstream. Heme is biosynthesized in both the bone marrow and the liver.
- <a href="https://en.wikipedia.org/wiki/Heme">Wikipedia</a></p>
</blockquote>
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