NonProfit Educational Fair Use Copyright Section 107 US The vaccine contains a spike protein called syncytin-1, vital for the formation of human placenta in women. It is also in the male sperm, Syncytin and its receptor are present in human gametes [Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm] localization and temporal appearance is consistent with a possible role in fusion between fema
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