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Table 1.

Longer midline interaction for leader axons is due to decrease in speed as well as higher frequency of retraction in leader axons

Midline
Away from midline
nAverage (μm/hour)Absolute (μm/hour)Average (μm/hour)Absolute (μm/hour)
Leader 17 35.6±4.5*, 58.2±9.2*, 86.9±6.9* 95.3±5.7* 
Follower 22 91.6±7.1 97±5.3 93.7±6.2 102.9±9.9 
Midline
Away from midline
nAverage (μm/hour)Absolute (μm/hour)Average (μm/hour)Absolute (μm/hour)
Leader 17 35.6±4.5*, 58.2±9.2*, 86.9±6.9* 95.3±5.7* 
Follower 22 91.6±7.1 97±5.3 93.7±6.2 102.9±9.9 

Mean±s.e.m. of average growth rates and absolute growth rates for leader and follower axons at and away from the midline. To ensure that different leader and follower axon retraction frequency did not vary with our sampling interval, timelapse data were collected at 1.5, 3 and 6 minute intervals. The table above is based on pooled data, as similar retraction percentages for both classes of axons were obtained independent of the sampling interval. The growth rates, either compensated for the increased retractions (absolute growth) or not (average growth) are slower at the midline for leaders (*P<0.001, Student's t-test). Similarly, the growth rates of the leaders are slower than follower axons at the midline (P<0.001,Student's t-test).

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