The IDOL algorithm identifies a library of 450 CpGs, resulting in an average R2 = 99.2 across cell types when applied to EPIC methylation data collected on artificial mixtures constructed from the above cell types. 
IDOL
An optimized library for reference-based deconvolution of whole-blood biospecimens assayed using the Illumina HumanMethylationEPIC BeadArray.Genome-wide methylation arrays are powerful tools for assessing cell composition of complex mixtures. 
Illumina HumanMethylationEPIC BeadArray