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Biochemical and biophysical methods have demonstrated differences in the surface topochemistry of murine T and B lymphocytes. On the surface of B cells, negatively charged groups of sialic acid, phosphate groups and unidentified acidic groups, positively charged amino groups and sulfhydryl groups are present. On the surface of T cells, which carry a higher net negative charge than B cells, the presence of phosphate and sulfhydryl groups has not been detected; the number of the positively charged groups is much smaller and that of carboxyl groups of sialic acid much larger than those on the B cell.