Figure 2. Sgs1, Dna2, and RPA preferentially resect the 5'-terminated strand of a DNA break.
a, Assay. b, Annealing of oligonucleotide to resection products (0.5 nM Sgs1, 0.5 nM Dna2, and 3 μM RPA) using probe complementary to either top (3'-) or bottom (5'-) strand, 300 nucleotides from end. c, Quantification of DNA end resection at various distances from DSB, based on experiments as shown in b.