Precursor B cells typically mature in the marrow, where they may become mature naïve B cells or may apoptose. Following antigen exposure, mature B cells may become short lived plasma cells, or may enter the germinal center and undergo somatic hypermutation and heavy chain class switching. | Precursor B cells typically mature in the marrow, where they may become mature naïve B cells or may apoptose. Following antigen exposure, mature B cells may become short lived plasma cells, or may enter the germinal center and undergo somatic hypermutation and heavy chain class switching. |