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. 2005 Nov;126(5):453–460. doi: 10.1085/jgp.200509387

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Copyright © 2005, The Rockefeller University Press

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Figure 1. — Structures of retinoids and retinoid analogues. All-trans-retinal (ATR), all-trans-retinol (ATRol), β-ionone, all-trans-C15 aldehyde, all-trans-retinoic acid (RA), all-trans-retinylidene-n-butylamine (ATR-NBu), all-trans-C17 aldehyde, and all-trans-C22 aldehyde. (All-trans-C15, C17, and C22 aldehydes are named based on the total number of carbons, including methyl groups, as per Buczylko et al., 1996. Though depicted as charged, the actual charge states of RA and ATR-NBu within the retinoid binding site are not known.)