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The expression of ACE2 and TMPRSS2 in human preimplantation embryos and embryonic stem cells. Dot plots indicate (a) ACE2 and (b) TMPRSS2 expression in all stages of human preimplantation embryos and in human embryonic stem cells. Data are presented as the mean ± SEM. FPKM, fragments per kilobase of transcript per million mapped reads
