Correction for both common and rare cell types in blood is important to identify genes that correlate with age. - Pellegrino-Coppola, Damiano; Claringbould, Annique; Stutvoet, Maartje; BIOS Consortium; Heijmans, Bastiaan T.; 't Hoen, Peter A. C.; van Meurs, Joyce; Isaacs, Aaron; Jansen, Rick; Franke, Lude; Boomsma, Dorret I.; Pool, René; et al. (BMC Genomics, 2021)