Assertion: sperm | /r/CapableOf | gain fusion competence7
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Source sentences:
text: The single-pass transmembrane proteins GAMETE-EXPRESSED 2 (GEX2) and HAPLESS 2 (HAP2; also known as GENERATIVE CELL-SPECIFIC 1 (GCS1)) are involved in sperm adhesion and fusion, respectively5,8,9, whereas egg cell-secreted small cysteine-rich EGG CELL 1 (EC1) proteins are necessary for sperm cells to gain fusion competence7.