Assertion: ganglion's role | /r/HasProperty | difficult to ascertain
Facets:
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).