Northern blot of RNAs isolated from undifferentiated and day 8 G/M differentiated serpin 2A transfected FDCP-Mix clones. Lane 1, undifferentiated; lane 2, differentiated Neomycin vector only control cells; lane 3, undifferentiated; lane 4, differentiated serpin 2A clone 4 cells; lane 5, undifferentiated; lane 6, differentiated serpin clone 5 cells; lane 7, undifferentiated; lane 8, differentiated serpin clone 6 cells. This was probed with serpin 2A and α-actin with signals being visualized by phosphorimaging (the RNAs were isolated from one of the experiments shown in Fig 9A).