UKGuy, an amylase test was performed on the spot of JonBenet’s blood on her panties and that showed up positive. This positive result indicated the presence of amylase.
From that researchers concluded there must have been saliva mixed in with the blood in the bloodspot since only saliva has high enough levels of amylase present to give such a positive result.
The cells within saliva that contain DNA are the epithelial cells that are sloughed off from inside the cheeks.
So the cells that contained the foreign DNA would have been an unknown male’s epithelial cells.
I’m sorry I can’t cite an official reference for this, however James Kolar made reference to the saliva determining amylase test in his book, Foreign Faction, Who Really Kidnapped JonBenet, pages 137 – 138
“Laberge indicated that the sample had flashed the color of blue during CBI’s initial testing of the sample, suggesting that amylase was present. Amylase is an enzyme that can be found in saliva, . . . . .”
I can’t imagine CBI giving false information to LaBerge and I can’t see LaBerge giving false information to Kolar and I think Kolar is honest and would not write false information in his book, so I believe the cells in the blood stain that contained the foreign DNA were epithelial cells.