Cross-validation between centres for inbred mice. Cross-validation between centres for inbred mice. (A) Total running distance in nightly activity of week 2 (standard wheel). 129 versus B6N, B6J, P<0.0005 and P<0.05, respectively; C3H versus B6N, P<0.01 (Fisher’s post-hoc test). (B) Average run duration in night activity of week 3 (complex wheel). C3H versus all P<0.0001; B6J versus B6N, 129, P<0.005 (Fisher’s post-hoc test). Data are group mean ± s.e.m. collected at CNR and MRC. Silvia Mandillo et al. Dis. Model. Mech. 2014;7:397-407 © 2014. Published by The Company of Biologists Ltd