Smad4 is a novel tumor suppressor gene which is mutated or deleted in about 50% of pancreatic carcinoma and 30% of colon cancer. SMAD4 was expressed in Pichia pastoris and was characterized. The molecular weight of the expression product was shown to be about 67 kD, and 13 amino acids in N terminal were determined and were identical with the putative sequence from Smad4 cDNA, and it was able to specifically react with the antibody against SMAD4.
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