... Eda K, KagawaW, Takata M, Takeda S, Yokoyama S & Shibata T(2001) Homologous-pairing activity of the humanDNA-repair proteins Xrcc3.Rad51C. Proc Natl AcadSci USA 98, 5538–5543.20 Kagawa ... Experimental proceduresDNA A 74-mer ssDNA (5¢-ACGGGTGGGGTGGACATTGACGAAGGCTTGGAAGACTTTCCGCCGGAGGAGGAGTTGCCGTTTTAATAAGGATC-3¢) (Hokkaido System Science, Hokkaido, Japan) and /X174 circular ssDNA(New ... preparedand their DNA-binding activities were measured:L6 6A, R6 7A, R6 8A, D6 9A, I7 0A, K7 2A, C7 3A, S16 2A, I16 3A, Y16 4A, E16 6A, D16 7A, P16 8A, R17 0A, and G17 2A. The I16 3A mutant became aggre-gated...