CD24 and myalgic encephalomeyelitis/chronic fatigue syndrome: Purified B cells from healthy donors exposed to agonists in transwell cultures showed a sharp decrease (~50%) of CD24+ B cells during the first 3 days of culture, but loss of CD24 from cultured B cells from ME/CFS patients was significantly “delayed” following stimulation, with a high proportion of cultured B cells from ME/CFS patients showing a continued expression of CD24 compared with B cells from healthy donors.