Afterwards, hydroxymethylbilane is converted to uroporphyrinogen III and catalyzed to coproporphyrinogen III via uroporphyrinogen III cosynthase and uroporphyrinogen decarboxylase, respectively.

之后，羟甲基过尿卟啉原III协同合成转尿卟啉原III，再由尿卟啉原脱羧粪卟啉原III。

Next, coprophyrinogen III is brought back into the mitochondria and converted into protoporphyrinogen IX by coproporphyrinogen oxidase.

然后，粪卟啉原Ⅲ被运送回线粒体，并过粪卟啉原氧转原卟啉原IX。

Afterwards, hydroxymethylbilane is converted to Uroporphyrinogen III and catalyzed to coproporphrinogen III, via uroporphyrinogen III co-synphase and uroporphyrinogen decarboxylase respectively.

之后，羟甲基色烷转尿卟啉原III，并分别过尿卟啉原Ⅲ共合与尿卟啉原脱羧形成粪卟啉原Ⅲ。