Recombinant plasmids, series pIAB and pIAH, have been constructed by insertion of BamHI or HindIII chromosomal fragments from Anacystis nidulans R2 into the tet gene of plasmid pACYC184. Plasmids pIAB and pIAH are stably maintained in Escherichia coli cells and transfer the CmR marker in transformation of Anacystis nidulans. Blot hybridization technique has shown the formation of CmR clones in transformation to result from integration of plasmid pACYC184 with the chromosome of cyanobacterium.
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