To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 3D rotation of AT2-TASCLong cellular extensions of a TASC (red) closely adjacent to an AT2 (green). Niche-mediated BMP/SMAD signaling regulates lung alveolar stem cell proliferation and differentiation Mei-I Chung, Melissa Bujnis, Christina E. Barkauskas, Yoshihiko Kobayashi, and Brigid L. M. Hogan Development 2018. 145:None-None; doi: 10.1242/dev.163014 Download Original Video