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Organization of nif genes in a 4.607-kb SacI fragment from pCQC102 containing the entire nifH1 and nifD1 genes and partial nifB1 and nifK1 genes (a), a 6.350-kb HindIII fragment from pCQC100 containing nifH2 and nifB2 (b), and a 2.840-kb EcoRI fragment from pCQC101 containing nifH3 (c). Restriction enzyme cutting sites are indicated as follows: A, HpaI; H, HindIII; H2, HincII; E1, EcoRI; E2, EcoRV; P, PstI; S1, SacI; and S2, SacII.
