RET is a single transmembrane-spanning receptor tyrosine kinase (RTK) that plays critical roles in the development of vertebrates. Structural analysis indicate that the ligand-binding RET ectodomain (RET-ECD) contains four consecutive cadherin-like domains (CLD1-CLD4) followed by a membrane-proximal cysteine-rich domain (CRD). This entry relates to CLD4 which is required for CRD folding [1].

1: RET recognition of GDNF-GFRalpha1 ligand by a composite binding site promotes membrane-proximal self-association. Goodman KM, Kjaer S, Beuron F, Knowles PP, Nawrotek A, Burns EM, Purkiss AG, George R, Santoro M, Morris EP, McDonald NQ; Cell Rep. 2014;8:1894-1904. PMID:25242331