Immunogen sequence: DKLNDMEPSK AVPLNASKQD GPMPKPHSVS LNDTETRKLM EECKRLQGEM MKLSEENRHL RDEGLRLRKV AHSDKPGSTS TASFRDNVTS P; Positive Samples: B-cell, Mouse heart, Mouse pancreas; Cellular Location: Endoplasmic reticulum membrane, Single-pass type IV membra