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Positions and sequences of PCR primers to amplify the indicated fragments of the MHC class II DRB gene in N. albiventris based on gDNA (a) and cDNA (b). Boxes symbolise exons, dark lines mark introns and dotted lines mark not sequenced parts of the introns. Open circles indicate positions of ligated vectorettes (see Materials and Methods for details). The primer DRB-L729 is taken from Bowen et al. (2004).
