dibutyryl adenosine 3',5'-phosphate ( dibutyryl cyclic amp ) ( 0.8-1.0 mm ) , adenosine 3',5'-phosphate ( cyclic amp ) ( 4 mm ) , 3-isobutyl-1-methylxanthine ( 10 microm ) , caffeine ( 1-2 mm ) , and cholera toxin ( 2 micrograms ml-1 ) applied for 20-30 min , all caused the l.t.p . of quantal content .
C0012054
dibutyryl
C0001455
cyclic amp