Autoradiogram of SSCP patterns of the QRDR of gyrA of C. jejuni isolates. SSCP patterns are designated as explained in the text and Table 1. Lanes: 1 and 16, 100-bp DNA ladder (Gibco BRL, Life Technologies, Inc., Gaithersburg, Md.) labeled with [γ-32P]ATP by using T4 polynucleotide kinase; 2 and 3, ciprofloxacin-susceptible isolates showing pattern IIICIP-S; 4 and 5, ciprofloxacin-resistant isolates showing pattern IIICIP-R1; 6 and 7, ciprofloxacin-resistant isolates showing pattern III CIP-R2; 8 and 9, ciprofloxacin-susceptible isolates showing pattern ICIP-S; 10 and 11, ciprofloxacin-resistant isolates showing pattern ICIP-R1; 12, ciprofloxacin-resistant isolate showing pattern ICIP-R2; 13, ciprofloxacin-resistant isolate showing pattern ICIP-R3; 14 and 15, ciprofloxacin-susceptible isolates showing pattern IICIP-S.