NEW YORK (TheStreet) -- In case you missed them, here are the top 10 most popular articles and videos on TheStreet today. Sign up for free email delivery of our daily Top 10. Biotech Stock Mailbag: Ampio, Cel-Sci and Ziopharm Adam Feuerstein Biotech columnist Adam Feuerstein answers readers' questions about health-care companies. 2 Bank Stocks to Sell and 1 to Buy From Citigroup Philip van Doorn Citi analyst Josh Levin on Thursday initiated or assumed coverage for 10 regional banks, with one "Buy" recommendation and two "Sell" calls.