Sorry, I ran out of credit pet drugs online ltd Some market attention has also shifted to speculation overpossible successors to Bernanke, though a senior White Houseofficial said on Friday that no announcement is imminent.President Barack Obama has signaled that Bernanke is likely tostep down when his second four-year term as Fed chairman endsJan. 31. Former U.S. Treasury Secretary Lawrence Summers andcurrent Fed Vice Chair Janet Yellen are among names cited.