FIG. 1.

Map of the ntn gene cluster and flanking genes of TW3 with its guanine-plus-cytosine content profile. Open reading frames are marked by the open arrows, the direction of the arrowheads indicating the direction of transcription. The solid lines below the open reading frame arrows represent the inserts of recombinant plasmids pTW3.6 from which the 579-bp HindIII probe was isolated and pTW3.10 from which the nucleotide sequence was derived. Only restriction sites relevant to the clones and construct described in this figure are shown.