Recombinant Fc receptor-like protein 4 (FcRL4) fragment (amino acids 20-387) is a high-purity protein designed for studying B-cell receptor signaling and immune response mechanisms. This 368-amino acid fragment includes all four Ig-like C2-type domains, making it an ideal tool for domain-specific functional assays and immunological research.

Fc receptor-like protein 4 (FcRL4) functions as an inhibitor of B-cell receptor signaling and plays a role in B-cell-mediated immune responses. The protein is localized to the cell membrane as a single-pass type I membrane protein, positioning it to interact with extracellular signaling components while maintaining intracellular connectivity. This strategic localization enables FcRL4 to modulate B-cell activation pathways, making it a significant target for understanding immune regulation and potential therapeutic interventions in immune-related disorders.