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Fig. 8. Data tracings of venom pressure recorded from the venom duct of Naja
nigricollis. Note that stimulation of the M. protractor pterygoideus (PP)
had minimal influence on venom pressure, and there was no additive effect when
stimulated simultaneously with the M. adductor mandibulae externus
superficialis (AMES). Note the marked increase in venom pressures recorded at
the venom duct compared to those recorded from the fang tip
(Fig. 7).