Assertion: histamine's effect | /r/HasProperty | blocked by antagonist of the h 4 r
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Source sentences:
text: This effect was not observed with mast cells deficient in the H 4 R and can be blocked by antagonist of the H 4 R, but not the other histamine receptors (Hofstra et al., 2003; Thurmond et al., 2004, 2014a).