Figure 1.

Gallus gallus chick biventer cervicis nerve–muscle preparation results after incubation with Heloderma venoms; (A) inhibition of indirect muscle twitches by Heloderma exasperatum (red), H. horridum (orange) and H. suspectum (purple) venoms relative to the initial twitches recorded prior to venom addition. Vehicle control shown in black; (B) effect of venoms on the contractile responses of the agonists acetylcholine (ACh), carbachol (CCh) and potassium chloride (KCl) relative to the initial response. All experiments were performed in triplicate.