. . . . . . . . . . . . . "a(CHEBI:histamine) -> cat(p(PFH:\"PDE4 Family\"))" . "Approximately 61,000 statements." . "Copyright (c) 2011-2012, Selventa. All rights reserved." . "BEL Framework Large Corpus Document" . . "1.4" . "1 microM histamine produced a 2- to 3-fold selective increase in PDE4 activity in U-937 cells after 4 hours of incubation" . . "Selventa" . . . . "2014-07-03T14:30:13.774+02:00"^^ . . .