our results indicate that , in contrast to human serum , rat serum and plasma contain large and variable amounts of dipeptidase activity that lead to a subestimation of the ace activity measured in 0.1 m potassium phosphate buffer , ph 8.3 , containing 0.3 m nacl , the most commonly used assay for human serum and tissue ace .
C0032105
plasma
C0229671
serum