Fig. 3.

Among 35 inbred strains of mice, mean daily wheel-running distance is negatively related to circulating leptin levels in females, but not for males (values not shown). The relationship is statistically significant for ranked values. Data are from the Mouse Phenome Database at The Jackson Laboratory (http://phenome.jax.org/). Values for wheel running are from Lightfoot (http://phenome.jax.org/db/q?rtn=projects/details&sym=Lightfoot1), whereas leptin levels are from Naggert (http://phenome.jax.org/db/qp?rtn=views/measplot&brieflook=14306&projhint=Naggert1).