Bmrobo1a and Bmrobo1b are first identified from the silkworm.
The structures of BmRobo1a and BmRobo1b are different from those of other Robo1 homologs.
BmRobo1a and BmRobo1b are localized in the nervous system of silkworm.
BmRobo1a and BmRobo1b control midline axon repulsion in the silkworm.