Based on meiotic recombinations within the Mom 2 region in the derivation of our congenic animals , we have narrowed the location of the Mom 2 locus and excluded Madh 2 , Madh 4 , and Madh 7 , as well as Mbd 1 , Mbd 2 , Dcc , and Tcf 4 , as candidates for the Mom 2 gene . . ^^^