from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a class of tetrapyrroles with four propionic acid groups and four acetic acid groups, involved in the synthesis of porphyrin.
But when catalyzed by the enzyme uroporphyrinogen decarboxylase, the rate of chlorophyll and hemoglobin production in cells "is increased by a staggering factor, one that's equivalent to the difference between the diameter of a bacterial cell and the distance from the Earth to the sun."
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