Integra Lifesciences Holdings Corp. has entered a definitive agreement to acquire regenerative medicine-focused Acell Inc. for an up-front cash payment of $300 million and up to an additional $100 million upon the achievement of certain revenue growth milestones. The deal is expected to close in the first quarter of 2021, subject to the satisfaction of customary conditions. It also comes almost three months after London-based Smith+Nephew plc said it was going to pick up the extremity orthopedics business of Integra for $240 million in cash.