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June B. Nasrallah, Mikhail E. Nasrallah, Pollen-Stigma Signaling in the Sporophytic Self-Incompatibility Response, The Plant Cell, Vol. 5, No. 10, Special Review Issue on Plant Reproduction (Oct., 1993), pp. 1325-1335
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Nasrallah et al. (1993) studied this question.
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