EIF2AK3 and plasma cell myeloma: We screened a panel of eight human myeloma cell lines (HMCLs) (L363, H929, U266, JJN3, RPMI-8226, OPM2, KMS11 and JIM3) for the expression of PERK mRNA (Figure 1A1) and protein (Figure 1A2,A3) levels.