The MICROBEnrich™ kit uses subtractive hybridization to selectively reduce poly(A)-tailed RNA and human, mouse, and rat rRNA without affecting the poly(A)-tailed meta mRNAs, as meta mRNAs do have poly(A) tails. This kit is used during sample preparation for metatranscriptomics, as it removes host mRNA and rRNA. How it remove human rRNA.