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Fig. 6. Data tracings from two separate experiments in which strain gauges were placed on the palatal mucosa (A) or scales over the nasofrontal joint (B) of two separate spitting cobras Naja nigricollis. In both experiments contraction of the M. protractor pterygoideus, either artificially (A) or during spitting (B), resulted in deformations of the palato-maxillary arch evident in the strain gauge tracings.





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