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Welcome to
LifeMap Discovery

Watch the introductory video to learn more about our database of embryonic development for stem cell research and regenerative medicine

All in Vivo Cells > Cell Card
Terminal Sacs

Alveolar Progenitor Cells (TSs)


At around E16.5 in the mouse, lung development switches from branching morphogenesis to the canalicular and saccular stages. These, in turn, lead to the final process of alveologenesis (also known as alveolization) that generates the functional units in the lungs, for gas exchange. In mice, this final stage occurs postnatally (P5–30), but in humans some alveoli form before birth and the process continues for many months afterwards.

E16.5 - E17.5
Alveolar Progenitor Cells
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent