Renin enzymatic activities in plasma samples were measured and quantified by cleavage of exogenous fluorescence resonance transfer (FRET) peptide substrates of renin FRET-QXL™520/5-FAM, optimized for mouse renin using a SensoLyte 520 mouse renin assay kit (AnaSpec, Fremont, CA, USA) as previously reported [35 (link),36 (link),37 (link),47 (link)].
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