– 2′-Deoxy-1,N6-ethenoadenosine-5′-O-triphosphate (ε-dATP), a fluorescent derivative of 2′-deoxyadenosine-5′-O-triphosphate (dATP), promotes sister chromatid exchange in stimulated primary mouse spleen T- and B lymphocytes with LPS or concanavalin A at concentrations of 50 to 150 µM. Utilized in ambiguous base pairing investigations within vinyl chloride-induced mutagenesis research, ε-dATP, along with its related compound ε-ATP—which exhibits an emission peak at 415 nm after being excited at 300 nm—contributes to understanding genetic alterations mechanisms.