using background genes to evaluate gene expression levels? what is the purpose of the background genes? which gene can be used to evaluate gene expression what is the purpose of using the background gene can you determine the expression of a gene when to use background genes for gene expression testing how to determine whether genes are expressed why use background genes using background genes to evaluate gene expression level why use background genes how does a background gene work which genes can be used for gene expression can background genes be used to assess gene expression level? what is gene analysis used for when are genes used? what is the use of background genes why use background genes how are genes evaluated using background genes to evaluate gene expression levels how do i determine whether the background genes are expressed