Primary structure of the crossover region in the genome of two intertype poliovirus recombinant

The nucleotide sequence of the crossover region on genomes of two intertypic (type 3/type 1) poliovirus recombinant, has been determined by the primer extension method. No deletions, insertions or rearrangements have been observed. Identical contiguous sequences, 7 or 11 nucleotides in length, respectively, have been found in two regions of the parental genomes, involved in the recombination.