Serum Epo (a) and hematocrit (b) levels following intranasal administration of vectors based on various AAV serotypes in mice. We intranasally administered 3 × 1011 GCs per mouse of AAV2/1-, AAV2/2-, or AAV2/5-CC10-rhEpo 4 weeks before the measurements. Control animals received the same set of vectors containing lacZ. Values shown are mean ± SD.