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Table 1 Summary of CH, D, JH gene segments in the duplicated loci.

From: Evolution of duplicated IgH loci in Atlantic salmon, Salmo salar

CH D JH in EST comment
IGH-A
τA-1 - - no exon 4 only
τA-2 2 2 no exon 1 and 2
τA-3 0 2 no has FS
τA-4 2 (5'); 3 (3') a 2 yes reverse orientation
τA-5 1 2 yes  
μ A 6 + 3 b 5 yes  
δ A - - yes  
IGH-B
τB-1 - 1 no has FS
τB-2 2 2 yes  
τB-3 0 0   no exon 1
μ B 6 5 yes  
δ B - - yes  
  1. a 5' and 3' relative to the τA-4 gene orientation, which is in reverse orientation compared to the rest of the locus.
  2. b The 3 D sequences are located approximately 20 kb 3' from the 6 D sequences and approximately 13 kb 5' of the J sequences.