Surprisingly, Nasal Axons Mistarget Along the A-P Axis in Ephrin-A5

Multiple Choice

Surprisingly, nasal axons mistarget along the A-P axis in ephrin-A5 knockout mice. In which cells is ephrin-A5 necessary for normal nasal axon targeting?

A) In the posterior tectum, via forward signaling
B) In the anterior tectum, via forward signaling
C) In the nasal RGC axons, via reverse signaling
D) In the nasal RGC axons, via forward signaling
E) In the temporal RGC axons, via reverse signaling