Michael Reth and his team are studying how the B cell antigen receptor (BCR) and the B cell surface is organized in resting and activated B cells for the sensing of foreign antigens. They learned that the BCR and many B cell surface markers are highly organized at nanoscale distances. In their studies they are using the CRISPR/Cas9 method to rapidly generate loss- or gain-of-function mutants of the Burkitt lymphoma cell line Ramos as specific cell line. They thus have generated Ramos B cells which are lacking all four components of the BCR and replaced the antigen receptor by the spike protein of SARS-CoV-2. This allows them to test for SARS-COV-2 spike specific antibody responses and monoclonal antibodies by flow cytometry. The first results of their assays will be discussed in the presentation. The webinar will be moderated by Rita Carsetti.