Fig. 2From: Comparative transcriptomic analysis delineates adaptation strategies of Rana kukunoris toward cold stress on the Qinghai-Tibet PlateauPrincipal components analysis (PCA) of gene expression of liver (circles), muscle (triangles), hibernation (red lines) and spring (cyan lines). The expression values, in terms of fragments per kilobase million (FPKM), were used as the input for PCABack to article page