- Nucleotide identities and divergence of our sequenced REV isolates comparable to other selected strains from China, Taiwan, Egypt, and the USA. The figure utilizes a comparative alignment of the LTR gene in which, the LTR nucleotide identity percentage of our three Egyptian isolates ranges from 96 to 100% comparable to other various referential strains. Besides, the amino acids identity percentage of our three Egyptian isolates ranges from 94 to 100% comparable to other various referential strains