Lastly, an iron molecule is added to a protoporphyrin IX via the enzyme ferrochelatase.

最后，铁分子通过亚铁螯合酶添加到原卟啉IX中。

Lead poisoning has also been shown to denature enzymes important in heme synthesis, like Delta aminolevulinate dehydratase and ferrochelatase, which are important for heme synthesis.

铅中毒同样也被证明会使血红素合成中重要的酶变性，如Delta-氨基乙酰丙酸脱水酶与亚铁螯合酶这一类对血红素合成至关重要的酶。