February 22, 2005 After taking a vacation for Presidents’ Day, stocks started off a new trading week by selling off throughout the session on Tuesday. Among some indexes, the decline was the biggest in almost two years. For its part, the Centient Biotech 200 lost a very substantial 2.13% in today’s trading, dropping 70.69 to close at 3255.46. Despite the sell-off, many stocks managed to gain ground, including Eon Labs, which received a buy-out offer from Novartis, and Impax Labs, which would like to get a similar offer from someone, while Targeted Genetics reported good Phase I data of its HIV/AIDS vaccine, Elan won European approval for Prialt, and Curis grew hair in the lab and believes it can do the same for people.