Immunogen sequence: PNEEEEAPVE DDADYEPPPS NDEEALQNSI LPAKPFPNSN SMYIDRPPSG KTPQQPPVPP QRPMAALPPP PAGRNHSPLP PPQTNHEEPS RSRNHKT. SLP-76 was originally identified as a substrate of the ZAP-70 protein tyrosine kinase following T cell receptor (TCR) ligation