The Massachusetts Life Sciences Center and Framingham-based Arch Therapeutics, Inc. celebrated the repayment of a $1,000,000 loan provided to Arch through the MLSC’s Accelerator Loan in 2012. Arch Therapeutics’ CEO Terrence W. Norchi, MD and CFO Rick Davis presented the ceremonial check to MLSC Board Member Pam Randhawa and State Representative Chris Walsh.