Assertion: mitochondrion | /r/CapableOf | produce the iron compound
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text: Beyond their role as energy converters, scientists have also recently uncovered how mitochondria play other critical roles: They act as storage tanks for calcium ions, which are involved in blood clotting and muscle contraction; produce the iron compound needed for red blood cells to transport oxygen; and, last but not least, they’re being studied as the lead “executioners” of cells, with the ability to trigger cell death.