Hydroxyl, Alcohol, OH, Carbonyl, Aldehyde, Ketone, C=O, Carboxyl, Acid, COOH, C(=O)OH, Amino, Amine, NH subscript 2 or 3, Sulfhydryl, Thiols, SH, Phophate, ATP, PO subscript 3, Methyl, Basically an attachment group, CH subscript 3

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