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Figure Caption
Fig. S2
Closing of a vascular loop by collateral vessel fusion.
A small branch forms a vascular loop with the major branches (1, arrow). The opening of the loop shrinks as the small branch approaches the major branch sidewise (2–3, arrows). The last very small opening is closed as the side walls of two vessels touch (5) and eventually connect to form a single lumen (6). Fusing lumens of the branches are marked with blue arrows. Scale bars: 10 µm. See also S5 Movie.
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