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Alpha endosulfine is a novel molecule, structurally related to a family of phosphoproteins.

We have observed that alpha endosulfine, the 13KDa form of the endogenous ligand for sulfonylurea receptor recently isolated from porcine brain, displays strong similarities with a phosphoprotein of similar size previously isolated from bovine brain and called ARPP-19. To determine whether the two proteins are different entities, we developed an RT-PCR strategy for analyzing the main portion of bovine alpha endosulfine. We show that alpha endosulfine and ARPP-19 are different entities from the same family of proteins, coded by distinct genes.