Fig. 1From: Gene expression profiling of postnatal lung development in the marsupial gray short-tailed opossum (Monodelphis domestica) highlights conserved developmental pathways and specific characteristics during lung organogenesisH&E staining of lung tissue samples collected from Monodelphis at different time points of postnatal development. Based on morphology as described in the text, the lungs of new born at day 1 (a) were in the canalicular stage, lungs collected at day 8 (b) and day 14 (c) were at early saccular stage, and at saccular stage by day 29 (d) and day 35 (e), while at day 61 (f) lungs were mature with an increased alveolar number similar to an adult lung (g). a Is a full embryo cross-section. Whole lung mounts (b to f), scale bar 1Â mm. See also Additional file 1: Figure S1 for pictures at higher resolution where individual cell nuclei are easier to identifyBack to article page