Fig. 3

a Secondary bronchi continue to form in lung explants cultured ex vivo. Shown are bright-field images for lungs of each species at 0, 24, and 48 h of culture. b Quantification of the relative positions of secondary bronchi in lung explants from chicken, quail, and duck. Shown are mean ± SEM for n _chicken = 9, n _quail = 8, and n _duck = 5. *p < 0.05; **p < 0.01, ***p < 0.001, as determined by one-way ANOVA with Tukey’s posttest