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Line M, 100 bp marker; line P, positive control; line 1, 389bp SHV-1; line 2, 189bp TEM-1; line 3, 250 bp VEB-1; line 4, TEM-1 and SHV-1; line 5, SHV-1 and VEB-1; line 6, TEM-1 and VEB-1. All lines contain 420 bp fragment 16S rRNA.
