j Experimental timeline for YGS pretreatment prior to transduction with pSARS-CoV-two. k, l ACE2+ (k) and ACE2/TMPRSS2+ (l) cells had been pretreated with serial threefold dilutions of YGS at a starting up focus of a hundred?mg/ml for 20?min 4 situations at four?h intervals and after that transduced with pSARS-CoV-two without the need of YGS. m PG