TY - RPRT TI - Spike protein cleavage-activation mediated by the SARS-CoV-2 P681R mutation: a case-study from its first appearance in variant of interest (VOI) A.23.1 identified in Uganda AU - Frazier, L. AU - Lubinski, B. AU - Tang, T. AU - Daniel, S. AU - Jaimes, J. A. AU - Whittaker, G. PY - 2021 DO - 10.1101/2021.06.30.450632 UR - https://www.biorxiv.org/content/10.1101/2021.06.30.450632v1 ID - 10.1101/2021.06.30.450632 ER -