Identification and reciprocal introgression of a QTL affecting body mass in mice Julian K. Christians, Kellie A. Rance, Sara A. Knott, Pat M. Pignatelli, Fiona Oliver and Lutz Bünger Genet. Sel. Evol., 36 5 (2004) 577-591 DOI: 10.1051/gse:2004018