History of the Universe eBook. 398 pages, 300 illustrations only £5.99
More than 100 amino acids occur in bacteria and plants, but only about 20 are commonly found in most animal proteins. They are:
alanine
arginine
asparagine
aspartic acid
cysteine
glutamic acid
glutamine
glycine
histidine
hydroxyproline
isoleucine
leucine
lysine
methionine
phenylalanine
proline
serine
threonine
tryptophan
tyrosine
valine
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