NB 3-1 generates the RP motoneurons which extend broadly reaching growth cones by late stage 15/early stage 16, covering the entire ventral muscle field.

NB 3-1 at stage 15/16:

 

Two ways to view the same clones:

upper left panel is a confocal z-series of DiI labeled clone; sections are 1.5 microns.

upper right panel is a projection of z-series, rotated 45 degrees about y-axis. DiI alone.

 

In all cases, anterior is up.