Douglas Cook, Dale Dreyer, Dominique Bonnet, Mary Howell, Emmanuel Nony, Kathryn VandenBosch, Transient Induction of a Peroxidase Gene in Medicago truncatula Precedes Infection by Rhizobium meliloti, The Plant Cell, Vol. 7, No. 1 (Jan., 1995), pp. 43-55
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Cook et al. (1995) studied this question.