Data processing was performed using the Intact Mass Analysis experiment within Biopharma Finder Version 5.1 (BPF 5.1). All 5 injections of a sample were processed together using the multiconsensus option in BPF 5.1. Source spectra was selected using the Sliding Windows feature and deconvoluted using the ReSpect deconvolution algorithm. VP1 sequences for AAV6 (ID: AAB95450.1), AAV8 (ID: AAN03857.1), and AAV9 (ID: AAS99264. ).