sli. \cite{Kelsom_2013}
slit1 is a second chemorepellant whose expression is found in the ventricular zone and subentricular zone of the GEs and in the embryonic POA. slit1 is abel to exert its chemorepulsive effects due to the expression of of its receptor Roudabout (robo1) on migrating cortical interneurons. interneurons are repelled from their sites of origins in the GEs thanks to slit and robo. \cite{Kelsom_2013}