Consecutive time-lapse images of MTs taken at 4 sec. intervals. Examples of growing (G) and shortening (S) MTs are marked. Tip locations of these MTs are manually tracked over time by marking on consecutive frames to calculate the growth and shortening statistics.
Altınok et al. BMC Cell Biology 2007 8(Suppl 1):S4 doi:10.1186/1471-2121-8-S1-S4