Karen E. Broglie, Phyllis Biddle, Robert Cressman, Richard Broglie, Functional Analysis of DNA Sequences Responsible for Ethylene Regulation of a Bean Chitinase Gene in Transgenic Tobacco, The Plant Cell, Vol. 1, No. 6 (Jun., 1989), pp. 599-607
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Broglie et al. (1989) studied this question.