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Ral is a low molecular weight GTP-binding protein belonging to the Ras superfamily of GTP-binding proteins and shows 50% amino acid identity to Ras. Ral cDNA clones have been isolated from human placenta, human pheochromocytoma, simian β-lymphocyte, and marine ray electric lobe cDNA libraries. In humans, cDNA sequences for Ral A and RalB have been determined. The predicted amino acid sequences show 85% identity. Both proteins consist of 206 amino acids with a predicted molecular weight of 24kDa. However, Ral A isolated from human platelets shows an apparent molecular weight of 26-28kDa. Ral A mRNA levels in adult mouse tissues appear to be highest in testes, ovary, and brain, with lower levels found in the liver, spleen, kidney, thymus, heart, and salivary glands. Similar results have been observed in rat tissues.Immunofluorescence, Immunohistochemistry, Immunoprecipitation, Western Blotting
