The unsubstituted cyclic tetrapyrrole nucleus that is the basis of the porphyrins.
See: porphyrins.
Compare: chlorin, phorbin, corrin.
Synonym: porphyrin.
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ascidiozooid
bile salt agar
ex
2-(N-bromoacetyl-N-hydroxyamino)-4-methylpentanonitrile
phenacetin
pectoral reflex
toxoneme
bemegride