Final Report Summary - TRANSVAC (European Network of Vaccine ... cordis.europa.eu/project/id/228403/reporting Oct 01, 2009 · - First cell bank: HEK293 (low passage) was produced a vial of passage 27 HEK 293 cells received from Microbix Biosystems Ltd. - Second cell bank: 911 MCB1 was produced from human 911 cells (sisters of the PER C6 cell line) obtained from Prof Rob Hoeben at the Leiden University Medical Centre.