Romy Catoira, Christine Galera, Francoise de Billy, R. Varma Penmetsa, Etienne-Pascal Journet, Fabienne Maillet, Charles Rosenberg, Douglas Cook, Clare Gough, , Four Genes of Medicago truncatula Controlling Components of a Nod Factor Transduction Pathway, The Plant Cell, Vol. 12, No. 9 (Sep., 2000), pp. 1647-1665
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Catoira et al. (2000) studied this question.