when sertoli cells were incubated with increasing concentrations of glucagon ( 1.28 ng/ml to 4.00 micrograms/ml ) in the absence and presence of either pia ( 1.0 microm ) or 2-chloro-adenosine ( 10.0 microm ) , the responses to glucagon , measured as camp formation , were almost completely abolished .
C0001443
pia
C0000275
2-chloro-adenosine