Fig. 1. Graphs of lateral growth in vivo. The upper panel shows growth as a function of time for a lateral that was followed for 18 hours. The lateral extended from less than 10 µm to more than 80 µm during this time period. The lower panel shows the width of this lateral at three distances from the base of the lateral. Rectangles are for a point 5 µm from the base, triangles 15 µm from the base and ovals 35 µm from the base. This lateral was nicely oriented parallel to the plan of focus and it did not move much during the experiment allowing it to be followed for longer than most. Some of the scatter in the data is probably due to slight variations in the orientation of the lateral, which both altered its length and made it difficult to measure being slightly out of focus.

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