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Effect of cysteine base (CYS, 1 mM); or saline (SAL; 0.1 ml) on the response of the isolated guinea-pig ileum to electrical stimulation before (hatched columns) and after exposure (60 min) to either BCA or PAG (both 1 mM). CON represents data from tissues prior to drug exposure. CON+CYS indicates contractions following 60 min incubation with cysteine. Results show tension developed (g) per twitch and are mean±s.e.mean, n=6, +P<0.05 c.f. CON, *P<0.05 c.f. BCA.
