PALM BEACH, Florida, June 21, 2017 /PRNewswire/ — As the markets head into the typical summer slowdown period, a few pharma and biotech stocks are putting up impressive performances today such as: Moleculin Biotech Inc. (NASDAQ: MBRX), Exelixis, Inc. (NASDAQ: EXEL), Immunogen, Inc. (NASDAQ: IMGN), Epizyme, Inc. (NASDAQ: EPZM) and Clovis Oncology Inc. (NASDAQ: CLVS) Moleculin…