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Plasmid maps of pIDN1 and pIDN3. Plasmids consist only of the ermC gene, a polylinker, an E. coli origin of replication, and two copies of the neisserial DUS. pIDN2 and pIDN4 (not shown) are the same as pIDN1 and pIDN3, respectively, differing only in the orientation of the polylinker.
