Many plants are self-incompatible — that is, they have mechanisms to prevent fertilization by their own pollen. A familiar and uncommonly versatile protein, ubiquitin, is found to be a central player in one such system.
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Newbigin, E., Vierstra, R. Sex and self-denial. Nature 423, 229–230 (2003). https://doi.org/10.1038/423229a