BMP receptor-regulated smad protein smad1 MADH1 protein dwarfin-A MAD homolog 1 Category=gene. PR:000000363 SMAD family member 1 mothers against DPP homolog 1 SMAD1 Mad1 Mad-related protein 1 BSP-1 transforming growth factor-beta-signaling protein 1 mothers-against-DPP-related 1 A BMP receptor-regulated smad protein that is a translation product of the human SMAD1 gene or a 1:1 ortholog thereof. MADR1 Dwf-A BSP1 SMAD 1 JV4-1