Table I.

Microtubule dynamic parameters

ParameterPlus-end peripheryPlus-end actin arc associatedMinus-end periphery
Growth 6.9 ± 0.3 3.82 ± 1.4 −
Shortening −11.5 ± 0.5 −3.06 ± 1.3 −5.62 ± 2.6
Catastrophe frequency 1.00 0.281 −
Rescue frequency 1.40 5.68 −
Percentage of time in growth 41.6 45.5 0
Percentage of time in shortening 25.0 5.0 59
Percentage of time in pause 33.4 49.5 41
  • Plus-end periphery (n = 49 MTs), plus-end shortening (n = 31 MTs) , and minus-end shortening (16 MTs); rates are μm min−1 ± sem. Catastrophe and rescue frequencies are min−1. Data compiled from 12 growth cones. Fluorescence images were collected a 5-, 10-, or 12-s intervals for 240–500 s of elapsed time.