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Answer for the clue "A complex red organic pigment containing iron and other atoms to which oxygen binds ", 9 letters:
protoheme

Word definitions for protoheme in dictionaries

WordNet Word definitions in WordNet
n. a complex red organic pigment containing iron and other atoms to which oxygen binds [syn: heme , haem , hematin , haemitin ]

Wiktionary Word definitions in Wiktionary
n. (context biochemistry followed by a Roman numeral English) A synonym for any of several hemes (followed by a letter)