FKBP51 is a marker of adipocyte differentiation. A, Western-blot analysis of FKBP51, FKBP52, PP5, Cyp40, and GAPDH in undifferentiated (U) and differentiated (D) 3T3–L1 cells. B, Densitometry analysis of panel A. C, Real-time PCR analysis of the indicated genes. Transcript expression was normalized to 18S mRNA. Statistical differences are indicated as follows: *, P > .05; **, P > .01; ***, P > .001. All data represent ±SEM (n = 3).