porphobilin

例句：

1. 1. He was diagnosed with a rare form of cancer that involves the production of porphobilin.
   他被诊断出患有一种罕见的癌症，这种癌症涉及产生卟啉。
2. 2. The porphobilin pigments are responsible for the red color of blood.
   卟啉色素是血液红色的原因。
3. 3. In some cases, porphobilin can be used to treat certain types of skin cancer.
   在某些情况下，卟啉可以用来治疗某些类型的皮肤癌。