The CD19 receptor is critical for B cell activation, driving the trafficking and assembly of CD19-CR2 and BCR complexes, thereby lowering the antigenic threshold for B cell clonal expansion. In T cells, CD19 contributes to CD3 localization and influences polarization. CD81 Protein, Human (His-SUMO) is the recombinant human-derived CD81 protein, expressed by E. coli , with N-6*His, N-SUMO labeled tag.
