4 ca2+ infusion had no significant effect on scl prolongation caused by adenosine ( 128 +/- 25 ms vs 151 +/- 31 ms ; before and at t = 40 min respectively ) , but caused pronounced enhancement of scl prolongation caused by atp ( 439 +/- 31 ms vs 1215 +/- 401 ms ; before and at t = 40 , respectively , p less than 0.02 ) .
C0001443
adenosine
C0001480
atp