Hi Margaret (and other interested readers), I have the same thing on chromosome 15, but not just on chromosome 15. Furthermore, I had my mom and dad both tested, and this "stripe" appears on chromosome 15 for my mom, but not so much for my dad. Other stripes appear elsewhere, seemingly haphazardly. We had some discussion about this on the genealogy-dna list. I made graphics for all the matches of my mom and my dad. You can see these "IBS hotspots" (i.e., stripes) here: http://freepages.genealogy.rootsweb.ancestry.com/~gbonner/DNA/FF/filmstrip.html I am guessing that it is due to inadequate mixing of solution near these spots on the chips of those effected, but am not sure how they are doing that, so don't know for sure. I'd still like some better explanation if someone has one. Best, Gregg >________________________________ > From: Margaret Waters <[email protected]> >To: [email protected] >Sent: Thursday, May 17, 2012 3:42 PM >Subject: [AUTOSOMAL-DNA] Strange observation > >While playing with my data at GedMatch, I noticed that I had nearly 50 >matches within a small range along chromosome 15. (I was using the >Chromosome Segment Comparison.) This is way more matches than I have on >any other chromosome and none so tightly bunched. Is this perhaps an >area where many unrelated people might have the same segment lineup (or >whatever the proper terminology might be)? > >Margaret > > >______________________________ >For answers to Frequently Asked Questions about mailing lists, please see: >http://dgmweb.net/MailingListFAQs.html > > >------------------------------- >To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message > > >