In regard to the recent discussion about the apparent discrepancy between SNPs PF3514 and FGC2408 at position 5578919 of the Y, I looked further at my Full Genomes results to see which named SNPs show the highest number of discrepancies with my FGC results. The winner hands down, with 57 discrepancies, was the PF series of SNPs, but the discrepant PF SNPs are all in only 2 PF number regions, from PF3503 to PF3564, and from PF5998 to PF6094. There were only 2 discordant SNPs among the F series, 1 for the Z series, and none for the CTS series. Some of these discrepancies could be due to second mutations at the same site, but I think most are due to simple errors. I found these by searching for "site of PF" (or "site of F", etc.) in my HaplogroupCompare file, which includes all of my SNPs which differ from the HUGO reference. So it appears that whoever entered the data in the original reference for the PF SNPs in the above regions was a little sloppy.