To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1 (related to Figure 3) Three-dimensional imaging of 8-week-old WT mammary glands with low magnification Side branching and luminal lineage commitment by ID2 in developing mammary glands Jinwoo Seong, Nam-Shik Kim, Jee-Ah Kim, Wonbin Lee, Ji-Yun Seo, Min Kyu Yum, Ji-Hoon Kim, Inkuk Park, Jong-Seol Kang, Sung-Hwan Bae, Cheol-Heui Yun, and Young-Yun Kong Development 2018. 145:None-None; doi: 10.1242/dev.165258 Download Original Video