Assertion: bullock | /r/HasProperty | the first
Facets:
Source sentences:
text: These cells had been suspected at least since Hans Lissmann had proposed in the 1950s that these fish possess a nonhuman sense of electric fields, but Bullock and colleagues were the first to establish what cells were carrying out this function (and thereby establishing that the sense existed [Keeley, 1999; Bullock, 1974]).