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The gene cphA encoding cyanophycin synthetase was interrupted in Anabaena variabilis ATCC 29413 by insertional mutagenesis. The mutant lacked cyanophycin granules and the polar nodules of heterocysts. The mutant grew as fast as the wild-type irrespective of the nitrogen source at low light intensity whereas growth on N 2 was somewhat reduced in high light. It is concluded that cyanophycin...
The genes encoding subunits A and B of V-ATPase in Cyanidium caldarium were cloned and sequenced. While the gene encoding subunit A is not interrupted by introns, the gene encoding subunit B contains seven introns ranging from 36 to 60 nucleotides.
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