CD3 epsilon Protein, a vital component of the TCR-CD3 complex on T-lymphocytes, is pivotal for adaptive immune responses. CD3E is crucial for proper T-cell development and contributes to TCR-CD3 complex internalization and down-regulation[1]. CD3 epsilon Protein, Rat (HEK293, Fc) is the recombinant rat-derived CD3 epsilon protein, expressed by HEK293 , with C-hFc labeled tag.