Answer the following question given this paragraph: 

Figure 42.13 B cell receptors are embedded in the membranes of B cells and bind a variety of antigens through their variable regions. The signal transduction region transfers the signal into the cell.


Q: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions?

 Choices:

- b.a.p cell receptors

- a.m. cell receptors

- er cell receptors

- b cell receptors

A:
b cell receptors
