Experiments were divided into two steps: the first step, the expression of NGF were investigated in healing impaired diabetic rat ulcer (a group) and normal rat ulcer (b group).
实验分两个步骤：第一步，对比糖尿病慢性难愈合创面大鼠组(a组)和正常大鼠创面(B组)组中ngf表达含量的变化。
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