A buying opportunity may have just opened up for biotechs By: MarketWatch September 22, 2015 at 07:26 AM EDT Stocks are a sea of red, but some say dismiss that Hillary Clinton tweet and buy biotechs. Read More >> Related Stocks: Bank of America Gsk Plc ADR Nasdaq Biotechnology Ishares ETF Roche Holding AG Basel American Depositary Shares Sanofi-Aventis S.A. ADR Volkswagen A G ADR