RARA and colorectal adenocarcinoma: We got a similar behavior of the slow fraction of VDR in response to calcitriol treatment and RXR cotransfection in Caco-2 colorectal adenocarcinoma cells as well (Fig. S6), with significantly different endogenous transcript ratios of VDR, RAR, and RXR as compared with HEK293 (according to the Human Protein Atlas (28) (http://www.proteinatlas.org)).