Readministration of AAV vectors by ATVRX in HB dogs previously exposed to AAV-2 vectors. (A-B) Canine FIX levels measured by ELISA and coagulation activity (WBCT in minutes [m]) in dogs D32 (red) and B46 (black) upon readminstration of an AAV2-cFIX vector via ATVRX. (D-E) Canine FIX levels measured by ELISA and coagulation activity (WBCT in minutes [m]) in dogs E59 (red) and H27 (black) upon readminstration of an AAV6-cFIX vector via ATVRX. (C,F) Creatinine phosphokinase (CPK) levels. x axis represents time in days.