a radioenzymatic assay for the measurement of histamine is described , based on the incubation of histamine in the presence of histamine-n-methyl-transferase from rat kidney and [ 3h-methyl ] -s-adenosyl-l-methionine ( sp act 15 ci/mmol ) in phosphate buffer , 0.05 mole/l , ph 7.9 , at 37 degrees c for 60 min .
C0019588
histamine
C0025779
histamine