Looks like no one added any tags here yet for you.
RAMs
Receptor associated molecules, Ig alpha and Ig beta
ITAMs
Immunoreceptor Tyrosine-Based Activation Motifs, can be phosphorylated to activate B-cells (also present in T-cells) as dimer of Ig alpha and Ig beta
Immature B-cells
Have IgM
Mature (naive) B-cells
Have IgM and IgD
Activated B-cells
Have IgM
Function of ITAMs
Signal transducers because tail of Ig is too short, become phosphorylated and serve as docking sites for adapter molecules
CD21
Membrane bound B-cell coreceptor that helps to bring antigens to BCRs in association with CD19 and CD81
C3d
Serves as a marker that binds antigens and brings them to B-cell receptors (especially B-cell coreceptor CD21), part of the complement system
CD4 ligand
MHC II
CD8 ligand
MHC I
CD2 ligand
CD58
CD28 ligand
CD80, CD86
CTLA-4 ligand
CD80, CD86
CD45R
CD22
CD5
CD72