from this study , bl appears to cover a broad range of the b-cell differentiation sequence , since the following ig phenotypes were observed : null cells ( sig- , cig- ) , large pre-b-cells ( intracytoplasmic mu-chains ) , small b-cells ( sig+ , cig- ) , and various types of secreting b-cells ( sig+ , cig+ ) .
C0006413
bl
C0004561
b-cells