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DNA fingerprints of E. coli isolates from cows experiencing recurrent episodes of clinical E. coli mastitis. Lanes labeled M contain molecular weight markers (1-kb ladder; Promega). Isolates from different cows are arranged in chronological order. Lanes LF (left fore), LH (left hind), RF (right fore), and RH (right hind) denote the quarter affected. Numerical lane labels denote the day of lactation on which the clinical episode occurred.
