Table 1.

Body composition of young adult M. musculus and P. leucopus

	Age, mo	MLSP, yr#	LQ	Body Weight, g	Fat Mass, g	Fat %	Lean Mass, g	Lean %
M. musculus (C57BL/6)	8.5	3.5	0.58	25.1 ± 1.1	7.0 ± 0.8	27% ± 2%	18.2 ± 0.5	73% ± 2%
P. leucopus	8	8	1.31	20.5 ± 1.3*	4.7 ± 0.9	22% ± 3%	15.9 ± 0.5*	78% ± 3%

Data are expressed as means ± SE; n = 8. Whole body fat mass, lean body mass, total mass, percent body fat, and percentage lean mass were measured using quantitative MRI machine. LQ denotes the longevity quotient, which is the ratio of maximal life span to the estimated life span based on the body mass.

^#Maximal life span potential (MLSP) values are taken from jax.org for C57BL/6 mouse and Anage database for P. leucopus.

^*P < 0.05 compared with M. musculus.