Let	$T{A}_{WB}$	= total transcript abundance (TA) of a gene in a WB sample
	$T{A}_{B cells}$	= TA of a gene in B cells present inside the WB sample
	$P_{B cells}$	= proportional cell count of B cells inside the WB sample (e.g., 5%) This value is assigned based on general knowledge or (in other settings) could be estimated from sample data by methods like deconvolution using TA data of other genes.
	$T{A}_{other cells}$	= transcript abundance of all other cell-types based on their respective proportional counts. (This is a hypothetical parameter that is not actually determined or measured but is used to present a general model.)
	X	= fold change difference between $T{A}_{B cells}$ and $T{A}_{WB}$, = $\frac{T{A}_{B cells}}{T{A}_{WB}}$ This is the observed difference in expression of a gene purified B cell samples and WB.