analysis of phosphoamino acids revealed two sites , phosphoserine and phosphothreonine . beta-glucuronidase from hepatoma consisted of a major subunit with molecular mass of 64,000 ( 64 kda ) and a minor subunit with 76 kda , whereas the hydrolase from normal liver had almost exclusively 64 kda subunit .
C0524823
phosphoamino acids
C0031724
phosphothreonine