Sequencing was performed by ‘‘DNA walking’’ using internal primers
derived from previously sequenced fragments (see supplementary
data, Appendix 5), with purified viral DNA as templates, and carried
out by the dideoxynucleotide terminator cycle sequencing method
employing a Prism BigDye Ready Reaction Terminator cycle sequencing
kit (PE Applied Biosystems). Reaction and cycling conditions were
chosen according to the manufacturer’s protocol. Sequencing reactions
were run on an ABI 3700 DNA analyzer (PE Applied Biosystems, performed
at the Center for Genomic Technologies, The Hebrew University)
and the resulting sequences were analyzed by BLAST