Most orchid flowers have an enlarged median petal, the ‘lip’, which plays a crucial role in attracting pollinators. The existence and appearance of this organ is due to the presence of specific protein complexes involved in floral development, which are differentially expressed in orchid species with more or less pronounced lips.
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Gravendeel, B., Dirks-Mulder, A. Floral development: Lip formation in orchids unravelled. Nature Plants 1, 15056 (2015). https://doi.org/10.1038/nplants.2015.56
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DOI: https://doi.org/10.1038/nplants.2015.56