(A to H) TUNEL assays of CEF coinfected with LA90 RSV and either RCASBP(A)-TAM67 or the control virus RCASBP(A) at the permissive (B, D, F, and H) and nonpermissive (A, C, E, and G) temperatures. Nuclei were stained with DAPI. Arrowheads indicate the positions of apoptotic cell nuclei. All photos were taken at a magnification of ×400. (I) Quantitation of the incidence of apoptosis as determined in the experiments described for panels A to H. Error bars represent standard errors.