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(A) Control (blue, 4′,6-diamidino-2-phenylindole (DAPI)) staining of N2A cell nuclei indicates healthy cells. The cells were cultured in the absence (A) or presence (B) of influenza vaccine or (C) S. Typhi vaccine for two days. Red-stained, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) nuclei indicate DNA breaks and, hence, apoptotic cells. DAPI (blue)-stained nuclei represent nuclei of healthy cells.
