porphyrinogen

例句：

1. 1. The body produces porphyrinogen to help protect against harmful ultraviolet rays from the sun.
   身体产生卟啉原以帮助保护免受太阳有害的紫外线辐射。
2. 2. He studied the chemical properties of porphyrinogen and its role in photosynthesis.
   他研究了卟啉原的化学性质及其在光合作用中的作用。
3. 3. In some cases, porphyrinogen can be converted into melanin during skin pigmentation.
   在某些情况下，卟啉原可以在皮肤色素化过程中转化为黑色素。