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

之后，羟甲基胆尿卟啉原III协同合成转化尿卟啉原III，再由尿卟啉原脱化粪卟啉原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，并粪卟啉原氧化转化原卟啉原IX。

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

之后，羟甲基胆色烷转化尿卟啉原III，并分别尿卟啉原Ⅲ共合与尿卟啉原脱化形成粪卟啉原Ⅲ。