ERN1 and infection: Among these transcription factors, nodulation signalling pathway 1 (NSP1) and 2 (NSP2), nuclear factor-YA1 (NF-YA1), ethylene response factor required for nodulation 1 (ERN1) and nodule inception proteins are involved in the transcriptional activation of the infection marker ENOD11 in the epidermis8, 9, 10, 11, 12, 13, 14, 15, 16.