Retraction notice to 'Highly antibacterial polypeptide-based amphiphilic copolymers as multifunctional non-viral vectors for enhanced intracellular siRNA delivery and anti-infection' [ACTBIO 58 (2017) 90–101]. (December 2021) - Zhou, Li; Xi, Yuewei; Yu, Meng; Wang, Min; Guo, Yi; Li, Peng; Ma, Peter X.; Lei, Bo