The binding of Nod factors to the Nod factor receptors (NFRs), which contain extracellular LysM motifs, initiates an interaction with the conserved SYMRK receptor-like kinases containing a leucine-rich repeat (LRR) domain.

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c-Cbl contains: 

a domain that binds directly to phosphorylated EGF receptors

a RING finger domain, which recruits ubiquitin-conjugating enzymes and mediates transfer of ubiquitin to the receptor

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According to the guard hypothesis, R gene products “guard” cellular proteins, which are called guardees or decoys

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The affinity of a signal molecule’s binding to its receptor is quantified by the dissociation constant for binding (Kd).