Figure 1.

Long term observation of the terminal part of a nerve cell process. Eleven successive scans of the terminal part of a nerve cell process performed within 520 minutes. Axes scales represent micrometers as denoted in (K). Yellow arrows in (A) indicate a structure that gradually merges with the neurite. The lamellipodium is clearly visible on the right hand side of each image as well as various filopodia sticking out of the neurite (marked by the red arrows). Scanning step sizes were 500 nm and 100 nm in lateral and vertical direction, respectively.