Jian Hua, Hajime Sakai, Saeid Nourizadeh, Qianhong G. Chen, Anthony B. Bleecker, Joseph R. Ecker, Elliot M. Meyerowitz, EIN4 and ERS2 Are Members of the Putative Ethylene Receptor Gene Family in Arabidopsis, The Plant Cell, Vol. 10, No. 8 (Aug., 1998), pp. 1321-1332
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Ma et al. (1998) studied this question.