SER SERINA THERAPEUTICS INC Investments/Divestments 8-K Filing 2024 - Amendment to Promissory Note AgeX Therapeutics, Inc. and Juvenescence Limited executed a Sixth Amendment to Amended and Restated Convertible Promissory Note extending the Repayment Date on a Secured Convertible Promissory Note.Get access to all SEC 8-K filings of the SERINA THERAPEUTICS INC