the finding of elevated levels of vip in the local circulation after induced penile erection in man and mammals and the ability of vip to relax the detrusor muscle of the bladder suggests that the peptide may be involved in penile erection and bladder relaxation , as does the marked vip depletion in the penis or bladder in patients suffering from diabetic impotence or bladder instability .
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the detrusor muscle of
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bladder