- alanine
- arginine
- asparagine
- aspartic acid
- citrulline
- cysteine
- cystine
- glutamic acid
- glutamine
- glycine
- histidine
- isoleucine
- leucine
- lysine
- methionine
- ornithine
- phenylalanine
- proline
- sarcosine
- serine
- threonine
- tryptophan or tryptophane
- tyrosine
- valine
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