HEK293 Flp‐In TRex (Invitrogen), HeLa (Austin et al, 2017 (link)), and HEK293 (ATCC CRL‐1573) cells were maintained in DMEM supplemented with FBS (10% v/v), and penicillin/streptomycin (pen/strep) (1%). Cells were cultured in an incubator set to 37°C and 5% CO2 and splitted when reaching confluency of ~70–90%, and regularly tested for mycoplasma.
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