What type of proteins are cytochromes classified as?

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Nucleotides containing pyridineNucleotides that include riboflavinFlavoproteins with metal componentsProteins containing iron-porphyrin complexes

Explanation

Cytochromes are proteins characterized by the presence of iron bound within a porphyrin ring, distinguishing them as iron-porphyrin proteins. They are not pyridine nucleotides, riboflavin-containing nucleotides, or metal-containing flavoproteins.