Polymorphisms in cDNA sequences from pro amplicons in 13 cancer cell lines and reference to 22 full-length or near full-length proviruses.

aNotations: “.” = same as in consensus, “n” = non detectable, “.G” = primary and secondary peaks of approximately equal detection, “–” = absent in alignment.bPosition in the reference HERV-K genome (K108).cPlurality sequence indicates the most common nucleotide at that position among amplicons from the 13 cell lines.