Thompson Street Capital Partners (TSCP), a private equity firm based in St. Louis, today announced its portfolio company Isto Biologics, a leader in surgical-based, osteo-biologic regeneration technologies and cell-based therapies, has acquired TheraCell, Inc., a California-based regenerative medicine company. The acquisition will strengthen Isto’s focus on offering extraordinary solutions for surgical and clinical care procedures within spine, orthopedics, and sports medicine. Terms of the transaction were not disclosed.