Amino Acids Aliphatic Amino Acids Aliphatic R groups are nonpolar and hydrophobic. Hydrophobicity increases with increasing number of C atoms in the hydrocarbon chain. The six aliphatic amino acids are Glycine, Alanine, Valine, Leucine, Isoleucine and Proline. Glycine (Gly or G) is an organic compound with the formula NH2CH2COOH. Having a hydrogen substituent as its side-chain, glycine is the smallest of the ...
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