HSC ELP => Pre-pro-B => Pro-B => Late-pro-B => Large-pre-B => Small-pre-B => Immature B
                                                                             Immature B => CD5-mature B
                                                                                           CD5-mature B => B1
                                                                                           CD5-mature B => Plasma B
                                                                             Immature B => Cycling B
