Opexa Therapeutics has made several key appointments to its management team. Karthik Radhakrishnan has been appointed chief financial officer, Kenny Frazier has been appointed vice president of clinical development and regulatory affairs, and Maryann Murray has been appointed as clinical development manager.   Mr. Radhakrishnan has more than 10 years of healthcare capital markets experience and most recently served as vice president at ING Investment Management in New York. Previously he was the...