a) Body weight, body length, b) tissue weights, c) body composition, and d) oxygen consumption, energy expenditure, ambulatory activity, RER, daily food intake and feeding efficiency in 8–10 week-old DKO and Ptpn1fl/flPtpn2fl/fl mice. e) Mice were administered leptin and body weights recorded. f) Fed plasma leptin levels. g–h) Hypothalamic gene expression in fasted mice injected IP saline, g) leptin, or h) insulin. Results are means ± SEM and are representative of at least 2 independent experiments; significance determined d–e, g–h) using two-way ANOVA.