Alanine, valine, leucine, and isoleucine, referred to as aliphatic amino acids , have saturated hydrocarbons as side chains. Glycine, which has only a hydrogen side chain, is also included in this group. Alanine has a relatively simple structure, a side chain methyl group, while leucine and isoleucine have sec- and iso-butyl groups. All of these amino acids are hydrophobic in nature.
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