Patsy's question about different blood types got me thinking, esp as others discuss poss def genes... How many people are of Jewish extraction, specifically from a russian immigrant background ?. In UK, I have spoken to various suffers and 70% are of a jewish background,others where not sure on relatives who may have married into the families many years ago, with a high percentage from immigration from eastern europe / russia.theres been a few Shalom's from people on here too which made me curious. Have there been any studies to trace back sufferers?. Please will people give a Yes / No to: Jewish. Eastern Eruope Ancestry. I'm not trying to catalogue people so please take no offence. I just want to get a general feel to see if its worth further research, as done in UK regarding a specific medical condition found across areas of UK population which has been traced to direct connection to a specific family / village in the 1600's in Denmark, the gene travelling across during the Danish invasions !! True.. PS Getting some good info re meds from people on here and although not a sufferer ( thank god !)am trying to help support someone close. Many thanks..