Assertion: ganglion's role | /r/CapableOf | ascertain in human
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Source sentences:
text: Most of these actions are mediated by noradrenaline, with the precise roles of peptides such as NPY and galanin being difficult to ascertain in humans (Ahren et al., 1991; Ahren, 2000; Ahlborg et al., 1992; Dunning and Taborski, 1988; Edwards and Bloom, 1996; Nonogaki, 2000; Verchere et al., 1996; Yamaguchi, 1992).