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Answer for the clue "Any of various pigments distributed widely in living tissues", 9 letters:
porphyrin

Word definitions for porphyrin in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context organic chemistry English) Any of a class of heterocyclic compounds containing four pyrrole rings arranged in a square; they are important in biochemistry in a form with a metal atom in the central cavity (hemoglobin with iron, chlorophyll with...

WordNet Word definitions in WordNet
n. any of various pigments distributed widely in living tissues

Wikipedia Word definitions in Wikipedia
Porphyrins are a group of heterocyclic macrocycle organic compounds , composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). The parent porphyrin is porphin , and substituted porphines are called porphyrins....

Usage examples of porphyrin.

The aureme, in equilibrium with chloraurate ion, entered the blood stream and was carried to the ovaries, where the gold was separated out and the porphyrin portion of the molecule disposed of by some as yet unidentified mechanism.

For example, porphyrin complexed with iron or magnesium is the nonprotein part of hemoglobin and chlorophyll.

I knew him fairly well ten years ago, when he was working on porphyrin syntheses.

Lanhoff find any evidence of porphyrins, or nitrogen compounds like purines and pyrimidines?

Cellulose, polypeptides, carotenoids, and porphyrins could be transformed to sugars, starches, proteins, and edible fats.

The buildup of toxic levels of these porphyrins in the bloodstream and urine produced a number of unpleasant side effects.