Each circle of the MEGAN tree represents a taxon in the NCBI taxonomy and is labeled by its name and the number of reads that were assigned to the taxon and not to a subtaxon. The size of the circle is scaled logarithmically to represent the number of reads.
图中圆圈大小代表该物种在该水平所占的比重(取了log值),比重表示只比对到该物种(不能
比对到该级以下的水平)的序列数。
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