Rapidly emerging SARS-CoV-2 B.1.1.7 sub-lineage in the United States of America with spike protein D178H and membrane protein V70L mutations - Shen, L; Bard, J D; Triche, T J; Judkins, A R; Biegel, J A; Gai, X (Emerg Microbes Infect 2021 Dec)