Total RNAs were extracted using TRIzol reagent and reverse-transcribed, as described [29 (link),41 (link)]. Quantitative real-time RT-PCR analysis (qRT-PCR) was performed and normalized with the internal control β-actin (ACTB) using commercial ready-to-use primers/probe mixes (Assays on Demand Products, Applied Biosystems): CD147 (assay Hs 00936295_m1), MCT4 (assay Hs00358829_m1), ACTB (assay Hs 9999903_m1) and ACE2 (assays Hs 01085331_m1 and Hs 01085333_m1) [29 (link),41 (link)]. The ABI PRISM 7700 DNA Sequence Detection System (Applied Biosystems, Foster City, CA, USA) was used [29 (link),41 (link)].
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