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ACE2 and TMPRSS2 mRNA expression in human epithelial cell lines. Total RNA was isolated from the cell lines, converted to cDNA and ACE2 and TMPRSS2 mRNA levels determined by RT-qPCR. The data are shown relative to expression in wild-type (wt) HEK293 cells (=1) and are the means from at least 2 independent experiments.
