this third phase of the atp response was only seen in electrically driven preparations in the presence of 8-phenyltheophylline ( 8-pt ) , an adenosine receptor antagonist . alpha , beta-methylene atp ( apcpp ) , a stable analogue of atp , produced only excitatory effects , while adenosine and beta , gamma-methylene atp ( appcp ) , a slowly degradable atp analogue , produced inhibition or inhibition followed by excitation .
C0001443
adenosine
C0001480
atp