(A) Human Hec1B cells were mock-infected or infected with rMP12-rLuc or rMP12-PKRΔE7 at an moi of 3. Then, cells were mock-transfected or immediately transfected with in vitro synthesized RNA encoding R173A NSs. Cells were collected at 16 hpi, and the abundance of PKR, phosphorylated eIF2α (Ser51), total eIF2α, R173A NSs, N and β-actin was analyzed by Western blot. (B) The relative abundance of phosphorylated eIF2α and NSs were analyzed. The density of phosphorylated eIF2α (normalized to total eIF2α) or NSs in mock-infected cells which are transfected with R173A NSs RNA is represented as 100%. The mean +/− standard deviation of three independent experiments is shown as a graph. Asterisk represents statistical significance (unpaired t-test, *p<0.05, **p<0.01).