Evidence for participation of GCS1 in fertilization of the starlet sea anemone Nematostella vectensis: Implication of a common mechanism of sperm–egg fusion in plants and animals

•GCS1 is a sperm transmembrane protein that is essential for gamete fusion in flowering plants.•The GCS1 gene is present not only in angiosperms but also in unicellular organisms and animals.•NvGCS1 gene is expressed in the testis and GCS1 protein exists in sperm of a sea anemone.•Anti-GCS1 antibodi...

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