meantime, xoma continues with its stock volatility. shares fell 14% today after rallying more than 30% earlier this week. the drop today came as xoma said an interim review of its diabetes-2 drug experiment couldn't determine how well the drug is distributed in the body. that won't be possible for another three months. dean foods saw the biggest rally among s&p 500 stocks today, but even with this 11% rally, d.f. remains below where it was trading in november before it issues a disappointing outlook. the rally was ignited as hedge fund appaloosa management disclosed more than a 7% stake. finally, auto part stocks were falling ahead of the north american auto show in detroit. borg warner, tenneco and dana holding each seeing some profit taking after big rallies over the past year. and that's tonight's market focus. >> susie: fed-ex and u.p.s. are under investigation by the justice department. anti-trust investigators want to know whether the two package delivery companies are trying to block customers from using third-party shipping neg