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Antigen S 100

A Family of highly acidic Calcium-Binding Proteins found in large concentration in the Brain and believed to be glial in origin. They are also found in other organs in the body. They have in common the EF-hand motif (EF Hand Motifs) found on a number of Calcium Binding Proteins. The name of this Family derives from the property of being soluble in a 100% saturated Ammonium Sulfate solution.