ho·mo·ser·ine | \ ˌhō-mō-ˈser-ˌēn 
, ˌhäm-ō- , -ˈsēr- \
, ˌhäm-ō- , -ˈsēr- \Medical Definition of homoserine
: an amino acid C4H9NO3 that is formed in the conversion of methionine to cysteine — see homocysteine
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