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Electrophoretic pattern of gyrB gene of A. hydrophila complex using specific set of primer described elsewhere by Yanez et al. (2003). Lane marked L refer to 100 bp DNA ladder. CP is a control positive (A. hydrophila strain, kindly supplied by Animal Health Research Institute in Dokki, Cairo). CN is a negative control (DNA free template). Lanes 1–16, the specific DNA product amplified from the representative retrieved isolates of O. niloticus with expected amplicons size of 1100 bp.
