At 2 days postransduction, cell culture medium was removed, and cells were lysed in 20 μl per well of 1× reporter lysis buffer (Promega) and then frozen at −80°C. After thawing, firefly luciferase (ffLuc) expression was measured in relative light units per second on a Synergy H1 Hybrid Multi-Mode microplate reader using 100 μl luciferin buffer (200 mM Tris [pH 8], 10 mM MgCl2, 300 μM ATP, 1× firefly luciferase signal enhancer [catalog number 16180; Thermo], and 150 μg/ml d-luciferin).
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