Fig. 4From: Establishment and comparison of air-liquid interface culture systems for primary and immortalized swine tracheal epithelial cellsHistological examination of immortalized STEC line and primary STECs cultured under Ali conditions. At D14, the cultures were fixed with 4% polyoxymethylene, then followed by histological sectioning and H&E staining. Ciliogenesis was assessed by counting the number of ciliated cells per randomly chosen microscope field (400 × magnification). Data are given as the mean +/− SD of three microscope fields per culture and three independent cultures (n = 9). (*P < 0.05, **P < 0.01)Back to article page