SMAD4 (SMAD Family Member 4, Smad-4, Deleted in Pancreatic Carcinoma, Deleted in Pancreatic Carcinoma Locus 4, Deletion Target in Pancreatic Carcinoma 4, DPC4, hSMAD4, JIP, MAD Homolog 4, MAD Mothers Against Decapentaplegic Drosophila Homolog 4, MAD Mothe Antibody