The Art of Cell Therapy -- Scope and Applicability of Autologous Cell Therapies -- Scale and Accessibility of Allogeneic Cell Therapies -- Acellular Stem Cell Products. Potency Assays: The Buggy Boo of Stem Cell Therapy -- Potency Assay Development: A Keystone for Clinical Use -- Quantifying Critical Quality Attributes -- Advanced Technologies for Potency Assay Measurement -- Potency Quality by Design: Tailoring for Specific Therapy -- Contract Research Organizations Expediting Therapeutic Availability -- Regulatory Authority Perspectives for Potency Release Criteria -- Illustrative Potency Assay Examples from Approved Therapies -- The Integrity of Potency Assays and Safe Intervention -- The Evolving Landscape of Potency Assays.