| defective forms of cotton leaf curl virus dna-a that have different combinations of sequence deletion, duplication, inversion and rearrangement. | tobacco and tomato plants inoculated at least 9 months previously with a pakistani isolate of cotton leaf curl virus (clcuv-pk), a whitefly-transmitted geminivirus, contained substantial amounts of circular dsdna molecules that were mostly about half the size of clcuv-pk dsdna-a. they appeared to be derived from clcuv-pk dna-a by various combinations of sequence deletion, duplication, inversion and rearrangement and, in a few instances, insertion of sequences of unknown origin. each of ten tobac ... | 1998 | 9634094 |