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Two percent agarose gel electrophoresis of cagA(A), vacA(B) and iceA(C) PCR products. A: Lane 1: DNA maker; lane 9: negative cagA, other lanes: cagA(324 bp); B: lane 1, 11 and 17: DNA maker, lanes 2,5,6,8,9: vacA s1 (259 bp), lanes 12-14:vacA m1b (291 bp), lanes 18-21: vacA m2 (352 bp); C: lanes1, 8: DNA maker, lane 2-6: iceA1 (247 bp), lanes 9-14: iceA2 (229 or 334 bp).
