. . . . . . . . . . . . "a(SCHEM:Tretinoin) -> r(RGD:Igfbp2)" . "Approximately 61,000 statements." . "Copyright (c) 2011-2012, Selventa. All rights reserved." . "BEL Framework Large Corpus Document" . . "20131211" . "Retinoic acid stimulates IGFBP-2 production by liver cells" . . "Selventa" . . . . "2014-07-03T14:32:09.106+02:00"^^ . . .