如果参数是空序列，fn： string (seq)将返回长度为零的字符串，另一个函数则返回空白序列。

If the argument is an empty sequence, fn: string (seq) will return a zero-length string, but the other function returns an empty sequence.

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随后在indent _ pat中构建一个新的正则表达式，精确匹配任何非空行的起始处的相同序列的空白(即拖尾' \ S ')。

It then builds a new regular expression in indent_pat that matches exactly the same sequence of whitespace at the start of any non-empty line (hence the trailing '\ s').

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结果显示，VEGF ASODN对U937细胞的VEGF的表达有明显的抑制作用，与错义序列组和空白对照组相比有显著差异（P<0 .0 5 ） ；

The result showed that VEGF ASODN had obviously inhibitive effect on expression of VEGF in U937 cell, as compared with scrambled sequence and negative control (P<0.05).

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