15 Heymsfield Heymsfield SB SB Fong Fong TM TM Gantz Gantz I I Erondu Erondu N N Fat and energy partitioning: longitudinal observations in leptin-treated adults homozygous for a Lep mutation Fat and energy partitioning: longitudinal observations in leptin-treated adults homozygous for a Lep mutation Obesity (Silver Spring) Obesity (Silver Spring) 2006 2006 14 14 258 258 265 265 16571851 16571851. The gene discussed is LEP; the disease is Obesity.