Partial deletion of Prok2 in the MOB induced changes in respiratory exchange ratio (RER) and fatty acid oxidation in fasted mice. Mice injected in the MOB with the scrambled-shRNA or Prok2-shRNA were placed in calorimetric cages (TSE system, Germany) 3 weeks postsurgery. RER (RER = VCO2/VO2, A-C) and fatty acid oxidation (D-G) were measured in fed conditions (A, B, D, E) or during an overnight fasting (C, F, G). Values represent mean with SEM (n = 6/group). The 24h- and the overnight fasting studies (A, C, D, F, G) were analyzed using 2-way ANOVA followed by post hoc Bonferroni test and the cumulative studies (B, E) were analyzed using an unpaired Student's t-test.