Smad1, Smad5, Smad8, Smad9 (SMAD-1, SMAD-5, SMAD-8, SMAD8A, SMAD8B, SMAD-9, BSP1, BSP-1, CMT2D, DPC4, GARS, HMN5, hSMAD1, hSMAD4, JV41, JV51, MAD Homolog 5, Mad-related Protein 1, MADR1, Madh6, Mothers Against Decapentaplegic Homolog 1, Mothers Against DP[Smad1, Smad5, Smad8, Smad9]