a, Rapid depletion of BAT triacylglycerol (TAG) species following i.v. injection of 1 mg/kg CL. b, Depletion of BAT diacylglycerol (DAG) species following i.v. injection of CL. c, Accumulation of free fatty acid species and acyl-carnitine species in BAT following i.v. injection of CL. d, Abundance of TCA cycle metabolites in BAT following i.v. β-adrenoreceptor agonism with 1 mg/kg isoproterenol or 1 mg/kg CL (n = 5; CL, iso n = 4). c, one-way ANOVA; d, two-sided t-test; data are mean of biologically independent samples ± s.e.m.