Persistence of functional memory B cells recognizing SARS-CoV-2 variants despite loss of specific IgG. - Winklmeier S; Eisenhut K; Taskin D; Rübsamen H; Gerhards R; Schneider C; Wratil PR; Stern M; Eichhorn P; Keppler OT; Klein M; Mader S; et al. (IScience, 2022)