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Summary diagram of lung development. The developmental degree of the lung at birth/hatching is indicated for six marsupials (Dasyurus viverrinus, M. domestica, Trichosurus vulpecula, Perameles nasuta, Phascolarctos cincereus, Petrogale penicillata, a monotreme (Ornithorhynchus anatinus) and an alticial eutherian (Mesocricetus auratus).
