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Table 1.

Total number of axons displaying different behaviours for each genotype

Axial level (r=rhombomere)Axonal behavioursSlit1-/-; Slit2-/-Robo1+/-; Robo2+/-Robo1-/-; Robo2+/+Robo1+/+;Robo2-/-Wild type
r2+r3 Number crossing between fascicles* i.d. 
 Number crossing the floor plate i.d. 
 Number longitudinally projecting axons in the floor plate i.d. 
r4+r5 Number crossing between fascicles* 12 20 12 
 Number crossing the floor plate 49 91 81 193 100 
 Number longitudinally projecting axons in the floor plate 25 17 61 
r6 Number crossing between fascicles* i.d. i.d. 
 Number crossing the floor plate i.d. i.d. 
 Number longitudinally projecting axons in the floor plate i.d. i.d. 
Number of embryos  n=3 n=6 n=8 n=7 n=11 
Axial level (r=rhombomere)Axonal behavioursSlit1-/-; Slit2-/-Robo1+/-; Robo2+/-Robo1-/-; Robo2+/+Robo1+/+;Robo2-/-Wild type
r2+r3 Number crossing between fascicles* i.d. 
 Number crossing the floor plate i.d. 
 Number longitudinally projecting axons in the floor plate i.d. 
r4+r5 Number crossing between fascicles* 12 20 12 
 Number crossing the floor plate 49 91 81 193 100 
 Number longitudinally projecting axons in the floor plate 25 17 61 
r6 Number crossing between fascicles* i.d. i.d. 
 Number crossing the floor plate i.d. i.d. 
 Number longitudinally projecting axons in the floor plate i.d. i.d. 
Number of embryos  n=3 n=6 n=8 n=7 n=11 

i.d., insufficient data.

*

Bundles of axons en route to the exit point

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