SH2D3A and infection: While it has recently been shown in L. japonicus that NIN directly controls the expression of NF-YA1 (Soyano et al., 2013), the relationship between MtNF-YA1 and NSP1 and NSP2 remains to be established, and unravelling these pathways should lead to a better understanding of the cross-talk between nodule development and infection.