Tamar Shahar, Nava Hennig, Tamar Gutfinger, Dana Hareven, Eliezer Lifschitz, The Tomato 66.3-kD Polyphenoloxidase Gene: Molecular Identification and Developmental Expression, The Plant Cell, Vol. 4, No. 2 (Feb., 1992), pp. 135-147
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Shahar et al. (1992) studied this question.