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Identification and quantitation of O-phosphoserine in human plasma fibronectin
FEBS Letters
|July 8, 1985
Abstract:
O-Phosphoserine was positively identified as the phosphorylated moiety in human plasma fibronectin by 31P-NMR of intact peptides. These data correlated completely with chemical analyses which demonstrated the presence of O-phosphoserine at a concentration of 2 residues/molecule. Neither O-phosphothreonine nor O-phosphotyrosine was detected in partial acid and partial alkaline hydrolysates, respectively.