...protocols and performing rigorous quality control (QC). The specific QC experiments performed varies for ...Link opens in a new window) . Transfections are performed using the transfer plasmid, a plasmid encoding...and stored at -80 °C. Titer Titering is either performed by Addgene or by the University of Pennsylvania...Pennsylvania Vector Core. In general, titering is performed by the facility that produced the viral vector lot....Pennsylvania Vector Core is (as of April 2016) also performed by droplet digital PCR (ddPCR). Quality Control.... To learn which specific QC experiments were performed on your lot, please contact us . Full sequencing...the Viral Genome Next-generation sequencing is performed on viral genomes isolated from the final AAV preparation...