Mice were injected intravenously with 5 × 1010 vector genomes of each serotype, then after 10 days the mice were killed and DNA was isolated from the brain, heart, liver, spleen, lung, kidney, and gastrocnemius muscle. Values were calculated as copies of GFP per diploid copy of mouse genomic DNA (laminB2 locus). (a) Spleen, lung, brain, kidney, heart, and gastrocnemius muscle. (b) Biodistribution in liver (note difference in scale). Error bars indicate standard deviation. Numerical values for all groups and P values are provided in Supplementary Tables S2 and S3, respectively.