Pharmaceuticals and biotechnology is the best performing sector today.Source Bioscience put in a solid trading performance during November and December 2010 and full year 2010 results should be in line with market expectations. "Both our LifeSciences and PharmaBiotech divisions demonstrated double digit organic sales growth during 2010 and our Healthcare division repeated the very strong performance it delivered in 2009", Source said. Pharmaceuticals giant and sector peer AstraZeneca is also making gains.Banks have turned lower after comments by the head of the Independent Banking Commission over stricter capital rules and the possible separation of the retail and investment bank arms. The political problems in Ireland have also unsettled financials. RBS and Lloyds are among the fallers.Top performing sectors so far todayTobacco 26,816.25 +2.02%Pharmaceuticals & Biotechnology 8,708.88 +1.63%Food & Drug Retailers 4,744.28 +1.37%Household Goods & Home Construction 6,521.74 +1.28%Industrial Transportation 2,499.07 +1.03%Bottom performing sectors so far todayIndustrial Engineering 6,406.51 -1.16%Automobiles & Parts 4,898.25 -1.13%Banks 4,982.78 -0.76%Life Insurance 4,179.33 -0.76%Software & Computer Services 703.49 -0.55%