Primers used for gene expression analysis in the study.

C1F, C1R; C2F, C2R; R1F, R1R; R2F, R2R; R4F, R4R; R7F, R7R: primers used for determining the expression of CRABP1, CRABP2, CRBP1, CRBP2, RBP4, RBP7 during C2C12 differentiation time; C2-GF, C2-GR and C2-AI-F, C2-AI-R: primers used for construction of the CRABP2 over-expression vector; MyoD-GF, MyoD-GR: primers used for construction of the MyoD over-expression vector; GAPDH-F, GAPDH-R: primers used as an internal control.