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Restriction map of the genomic region containing the ispA gene from E. coli. The genomic region cloned in λ19F6 (21) is shown on top. The fragments subcloned into plasmids pLR1, pLR2, and pLR3 are also indicated. The position of the ispA gene is represented by a solid box. Restriction sites are as follows: B, BglII; H, HindIII; N, NdeI; P, PstI; Sm, SmaI; Sp, SphI; X, XhoI.
