GFRalpha receptors GFRalpha1 and possibly also GFRalpha2 and GFRalpha4 subunit of the GDNF (glial cell line-derived neurotrophic factor) receptor interact in cis with NCAM and functions as a coreceptor for GDNF in the absence of RET. The NCAM1-GFRalpha1 interaction down regulates NCAM1-mediated cell adhesion and promotes GDNF-NCAM1 binding.
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