This targeted mutation substitutes a 6-kilobase genomic DNA segment containing hs3b (Rr155) and hs4 (Rr156), the two most distant of four 3' transcriptional enhancers residing within the approximately 26 kb locus control region downstream of the Igh complex, with a loxP-flanked neomycin resistance gene cassette. (J:71300)
Legend:
cx: complex: > 1 genome feature ot: other: hemizygous, indeterminate,... (F): Female
(M): Male
N: normal phenotype
(#): related diseases count