Alanine
= Alanine
{title2=$\mathrm{Ala},\ \mathrm A$}
{wiki}
Alanine is an <amino acid> represented by Ala or A in <protein> sequence notation. GCU is one of its <codons> in the standard <genetic code>, and supplies the second residue in the worked <gene expression> example. https://openstax.org/books/biology-2e/pages/15-1-the-genetic-code[OpenStax Biology 2e, 15.1: alanine codons]{ref}