Table 1.

Summary of molecules present in the FP that have been proposed to act as short-range commissural axon guidance cues.

Name	Model	Proposed function	References
Ngcam-related CAM (Nrcam)	Mouse, chicken	Promotes growth of commissural axons across the FP	Stoeckli and Landmesser (1995)
Slits	Mouse, chicken	Repels post-crossing commissural axons from the FP	Brose et al. (1999), Long et al. (2004)
Class 3 semaphorins	Mouse, chicken	Repels post-crossing commissural axons from the FP	Nawabi et al. (2010), Zou et al. (2000)
Fspondin	Rat, chicken	Promotes growth of commissural axons across the FP	Burstyn-Cohen et al. (1999)
Neuropilin2	Mouse	Promotes growth of commissural axons across the FP	Hernandez-Enriquez et al. (2015)
P84	Mouse	Role unresolved, may serve as a substrate for axon outgrowth.	Chuang and Lagenaur (1990)
Neurite outgrowth inhibitor (nogo) b (reticulon4b)	Mouse	Repels post-crossing commissural axons from the FP	Wang et al. (2017)
Dystroglycan	Mouse	Repels post-crossing commissural axons from the FP	Wright et al. (2012)
Nectin3	Mouse	Promotes for correct axon fasciculation, and rostral turn for post-crossing axons	Okabe et al. (2004)
MAM domain-containing glycosylphosphatidylinositol anchor (Mdga) 1	Chicken	Function has not been characterized	Fujimura, Iwashita, Matsuzaki, and Yamamoto (2006)
Mdga2	Chicken	Promotes rostral turn for post-crossing axons	Joset et al. (2011)
Synaptic cell adhesion molecules (Syncam)/nectin-like molecules (Necls)	Chicken	Promotes growth of commissural axons across the FP and rostral turn for post-crossing axons	Niederkofler, Baeriswyl, Ott, and Stoeckli (2010)
Plexina2	Chicken	Promotes growth of commissural axons across the FP and rostral turn for post-crossing axons	Andermatt et al. (2014)