by University of Freiburg A) UMAP projection of composite healthy donor (HD) samples from CD19+ cells of tonsil (n=7) and spleen (n=7) analyzed by spectral flow cytometry. (B) Identification of primary populations in one representative HD spleen and tonsil. (C) Identification of populations in the naïve B cell gate (IgD+CD38low). (D) Identification of populations within the...