(A) Schematic representation of the structure of In31. ORFs are indicated by arrows. •, the 59-base elements of the gene cassettes. (B) Restriction map of the corresponding region. (C) Subclones used for sequencing and functional analysis of resistance genes (see text and Table 1 for further descriptions of subclones). B, BamHI; Sp, SphI; S, SmaI; Kp, KpnI; E, EcoRI; H, HindIII; C, ClaIRV, EcoRV; X, XbaI.