chromosomal duplication http://identifiers.org/mgd/MGI:5466601 O Dp(4)20H|Dp(In4A3;4B1)20H MGI:5466601 Dp(In4A3;4B1)20H Cytogenetic Marker duplication, inverted Chr 4, Harwell 20 syntenic Dp(4)20H Dp(In4)20H