Working Cell Bank (WCB)

Working Cell Bank (WCB) designates a collection of vials containing a defined, qualified cell line derived from the Master Cell Bank, stored under controlled conditions and used routinely for manufacturing or production campaigns. The WCB serves as the operational source of cells for inoculating production processes, ensuring consistency, traceability, and controlled genetic and phenotypic characteristics across batches, while reducing risk to the Master Cell Bank by limiting its use.

The biopharmaceutical industry relies on WCBs for manufacturing recombinant proteins, monoclonal antibodies, vaccines, viral vectors, and other biologic products. WCB generation involves expansion of Master Cell Bank material under controlled conditions, followed by harvesting, formulation with cryoprotectants, aseptic filling into vials, and storage typically in vapour-phase liquid nitrogen. Comprehensive testing confirms identity, viability, sterility, absence of mycoplasma, and genetic stability. Operational use of WCB vials follows controlled procedures for thawing, expansion, and seed train development, with documentation ensuring batch-to-batch reproducibility. WCB management includes inventory control, monitoring of storage conditions, and periodic evaluation of cell performance to detect drift over time. As biologics manufacturing expands and lifecycle durations extend, robust WCB strategies remain essential for maintaining process consistency, supporting regulatory compliance, and ensuring reliable product supply.