Figure 2

(a) The effects of D. russelii (1 mg/kg, i.v.) venom on the mean arterial blood pressure (MAP) of anesthetised rats in the presence (n = 5) or absence (n = 4) of artificial respiration, and in the presence of prior ‘priming’ with P. textilis venom (2 µg/kg, i.v., n = 6). (b) The effects of E. ocellatus (50 µg/kg, i.v.) venom on MAP of anesthetised rats in the presence (n = 5) or absence (n = 4) of artificial respiration, and in the presence of prior ‘priming’ with either P. textilis venom (2 µg/kg, i.v., n = 5), or one or two sequential doses of E. ocellatus venom (1 µg/kg, i.v., n = 3–4) venom. *P < 0.05 significantly different from response to same venom alone.