Identifying NF-YC and NF-YB partners of NF-YA1 involved in infection and nodule organogenesis in Medicago, as well as additional proteins interacting with NF-YA1-containing heterotrimeric CBF complexes, would certainly provide new insights into the signalling and developmental pathways controlled by MtNF-YA1. The gene discussed is CEBPZ; the disease is infection.