| porphin | <protein> A cyclic tetrapyrrole in which the four pyrrole groups are linked by their alpha-carbon atoms via methene (-CH=) bridges, porphin is the partial compund of porphyrins. (14 Oct 1997) |
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| porphine | The unsubstituted cyclic tetrapyrrole nucleus that is the basis of the porphyrins. See: porphyrins. Compare: chlorin, phorbin, corrin. Synonym: porphyrin. (05 Mar 2000) |
| porphin |
a heterocyclic structure composed of four pyrrole rings connected by methylidyne (—CH=) bridges; it is the parent skeleton of the porphyrins.
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