2. Materials and Methods 2.1. Cells and Culture Conditions HEK293T and VeroE6 cells were purchased from ATCC (#CRL-11268 and #CRL-1586, respectively) and cultured in complete medium (Dulbecco’s Modified Eagle Medium (DMEM, ThermoFisher Scientific, Waltham, MA, USA #11885-084), supplemented with 10% Fetal Bovine Serum (FBS, ThermoFisher Scientific, #26140-079), 1% Penicillin–Streptomycin (ThermoFisher Scientific, #15070-063), and 1% L-glutamine (ThermoFisher Scientific, #25030-081)).