Hairy cell leukemia is a cancer of white blood cells that responds to treatment with drugs that inhibit dna synthesis. a mutation in the braf gene, designated braf v600e, is associated with hairy cell leukemia. braf v600e differs from the nonmutant braf gene in a single base pair. imagine that the single base-pair change added a haeiii restriction site indicated by the arrow on the gene below. you decide to identify hairy cell leukemia with pcr and the restriction enzyme haeiii.