SYMPK and infection: The close association of CEP7 with symbiosis was also confirmed (a) by its elevated expression in skl, (b) the requirement of the Sym pathway, NFs, and the CRA2 receptor for SymCEP7 to increase the frequency of infection-associated events and nodule number, (c) by the ability of SymCEP7 to induce miR2111 expression, (d) by the lack of expression of other CEP genes in skl, and (e) the inability of SymCEP7 to reduce lateral root number.