Humanized sequence|Conditional ready|Inserted expressed sequence|Reporter Gt(ROSA)26Sor<tm2(EWSR1/ATF1)Mrc> targeted mutation 4, Mario R Capecchi MGI:5495288 Gt(ROSA)26Sor<tm4(EWSR1/ATF1)Mrc> http://identifiers.org/mgd/MGI:5495288