[Term] id: PR:000000647 name: SMAD family member 1 isoform 1 phosphorylated 1 def: "A SMAD family member 1 isoform 1 phosphorylated form in which the phosphorylation occurs at the C-terminal SSxS motif as a result of the activation of the bone morphogenetic protein (BMP) signaling pathway. Example: UniProtKB:Q15797-1, Ser-463/Ser-465, MOD:00046." [PMID:9136927] comment: Category=modification. synonym: "SMAD1/iso:1/Phos:1" EXACT PRO-short-label [PRO:DNx] synonym: "BMP receptor-activated SMAD family member 1" RELATED [] is_a: PR:000000571 ! SMAD family member 1 isoform 1 phosphorylated form relationship: has_part MOD:00046 ! O-phospho-L-serine