A question for Bill: In the section 'Methods--Part I : Forming the RCC Matrix' of your first paper, you say 'Results from 67 markers can also be used; they are virtually identical to the results using 37 markers.' I've taken the 62 111-marker M222 results I have on file, and calculated RCC values between Ewing kit number 26605, and the remaining 61 testees. I calculated RCC's separately over 37, 67 and 111 markers. The results can be seen at http://dl.dropbox.com/u/2733445/RCCFILE.csv At this stage I'm working on the assumption that I have done something wrong, because the results I get vary dramatically depending on whether you use 37, 67 or 111 markers. A case in point is the comparison between Ewing 26065 and Paterson 118913. The results I get are 37 markers RCC = 12.7 67 markers RCC = 32.2 111 markers RCC = 59.2 Are you able to check my calculations? I can send you my file of the 111-marker results if you have difficulty extracting them from the M222 site. Sandy