What structure is on the be cell that helps recognize pathogen?

The structure on the B cell that helps recognize pathogens is the B cell receptor (BCR). The BCR is a complex of membrane-bound proteins that includes an immunoglobulin (Ig) molecule, two immunoglobulin alpha (Ig alpha) chains, and two immunoglobulin beta (Ig beta) chains. The Ig molecule is the antigen-binding component of the BCR and is responsible for recognizing and binding to specific antigens. The Ig alpha and Ig beta chains are involved in signal transduction and help to activate the B cell upon binding of antigen to the Ig molecule.