bilin

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bi·lin

, biline (bī'lin, -līn),
The chain of four pyrrole residues resulting from the cleavage of one bond of one of the four methylidene residues of the porphin part of a porphyrin; specifically, the unsubstituted tetrapyrrole; bilirubin and biliverdin are bilins.

bilin

(bī′lĭn)
n.
Any of various organic pigments that contain four linearly arranged pyrrole rings.