精英版，覆盖率低的，其实是N的问题，和Y的重复片段问题。微基因覆盖率比Novaseq还要高，99.9%左右

统计的length_of_chromosome的长度是全部的碱基的长度，其中包含N，微基因统计的染色体长度是去掉N的，所以统计出来的覆盖率偏低（如21,22号染色体）； Y染色体之所以更低是因为Y染色体中含有很多重复的序列，做比对分析的时候是把这些mask掉了（如果把这些也算进来会造成multimap的比例较高，不利于后面的分析），所以用来计算覆盖率的Y染色体的长度比实际的短很多。
纠正后。算出来都是99.9%了，而 illumina+抽血+Novaseq纠正后，算出来才 99.45%，额，微基因获胜。赞一个
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