“Antagonists of GABA(A) (bicuculline; 10 microM), GABA(B) (phaclofen; 0.2-0.5 mM), glycine (strychnine; 10 mM), adenosine ( aminophylline ; 100 mM) or opioid (naloxone; 1 mM) receptors were added to the bathing solution to block inhibitory synaptic transmission.”