The number of clinical studies continues to increase for candidate gene therapies based on adenoassociated virus (AAV) vectors. Application of different AAV serotypes has enabled drug developers to target a large panel of tissues and to address a breadth of diseases — but with the drawback that each serotype necessitates a distinctive purification process. Such development work requires considerable resources and results in long process-development timelines, which can cause significant delays to entering clinical trials. Thus, gene-therapy companies and contract…