Immunogen sequence: SSCALNMWLA KSVPVMGVSV ALGTIEEVCS FFHRSPQLLL ELDNVISVLF QNSKERGKEL KEICHSQWTG RHDAFEILVE LLQALVLC Antigen sequence identity: Mouse 93%; Rat 95%. Upstream regulator of interferon-induced serine/threonine protein kinase R (PKR). May bloc