A cluster of acidic residues in the cytoplasmic domain of SARS-CoV-2 Spike is required for virion-incorporation and infectivity - Charlotte A. Stoneham; Rajendra Singh; Amalia De Leon; Petra Tafelmeyer; Francisco Acosta; Angus Fuori; Michael Anderson; Peter W. Ramirez; Hannah S. Schwartzer-Sperber; Satish Pillai; Mary K. Lewinski; John Guatelli (PLoS ONE, 2026)