mM NaCl and 25 mM tris-acetate at pH 7.0.14 After 0.5 h incubation at 24 OC, 4 mM dithiothreitol was added to initiate strand cleavage. The reaction was allowed to continue for 6 h (24 "C). The double strand cleavage products were separated on a 0.4% vertical agarose gel which resolves DNA segments up to 25 kbp in size (Figure 3). Therefore, DNA uniquely labeled at the R and
pH 7.0.14 的 mM NaCl 和 25 mM tris-
乙酸盐 在 24 ℃下孵育 0.5 小时后,加入 4 mM 二
硫苏糖醇以启动链裂解。使反应持续 6 小时(24°C)。双链切割产物在 0.4% 垂直
琼脂糖凝胶上分离,该凝胶可解析大小高达 25 kbp 的 DNA 片段(图 3)。因此,DNA 在R 和