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Dot-plot analysis of the bovine DJC region on Chr4.003.108. Duplication of a ~7 Kb region (diagonal line between black arrows) has generated a third DJC cluster. One of the homology units incorporates TRBC1, TRBD2 and the TRBJ2 whilst the other incorporates TRBC2, TRBD3 and TRBJ3. Smaller lines parallel to the main diagonal reflect the similarity in sequence of TRBC3 with TRBC1 and 2 (grey arrows).
