Analysis of HPV-16 markers in non-spermatozoal cells from semen samples. a: FISH analysis of HPV-16 DNA in non-spermatozoal cells from semen samples. a I epithelial and a II non epithelial positive cells. Reference brigh-fiels pictures (BF) are added as inserts. b: FISH and immunofluorescence analysis of HPV16-E6 or HPV16-L1 expression on HPV-DNA bearing non-spermatozoal cells. b I HPV16-E6 protein and b II HPV16-L1 protein positive round cells.