plasma membranes , prepared from macroscopically normal human peripheral lung , were incubated with 10 nm 5'-n-ethylcarboxamido [ 3h ] adenosine ( [ 3h ] neca ) and various concentrations of competing ligand under experimentally determined optimal conditions : 4 degrees c , ph 7.4 , 5 mm mgcl2 , 1.8 mg protein/ml , 30-min incubation time .
C0001443
adenosine
C0050789
neca