Fig. 2From: Novel reference genes in colorectal cancer identify a distinct subset of high stage tumors and their associated histologically normal colonic tissuesHCA and PCA analysis of 21 classical reference genes in 79 CRC pairs. a. Differential expression of 21 reference genes among 79 CRC pairs in HCA. b. Differential expression of 21 reference genes among 79 CRC pairs in PCABack to article page