如何得到理想的DNA酶切效果？How to get a better DNA cut results?

A) DNA洗脱前没有充分风干; B) DNA纯度不够; C) DNA 量太多; D) 酶质量问题。

A) Before DNA elution, WB2 residue was not dry out; B) DNA purity was not high enough; C) Too much DNA; D) Poor quality of digestion enzyme.