US STOCKS-S&P 500 ends at record high on Greece hopes, as bonds drop
* Investors watching situations in Greece, Ukraine
* S&P 500 ends above 2,100
* Celsus shares plummet after drug fails study
* Indexes: Dow up 0.2 pct; S&P 500 up 0.2 pct; Nasdaq up 0.1 pct (Updates to close)
By Caroline Valetkevitch
NEW YORK, Feb 17 (Reuters) - The S&P 500 ended above 2,100 at another record high on Tuesday as optimism grew that a debt deal would be reached with Greece and as bond prices sold off.
In a possible sign of progress for Greece, a source told Reuters the country intends to ask for an extension of a loan agreement Wednesday. The report follows a collapse of deal negotiations on Monday, which led to European Union finance ministers pressuring the country to remain in an international financial rescue program.
Late in the session, though, broadcaster ZDF reported the German finance minister said an extension was not up for debate.
U.S. Treasury debt prices sold off, pushing benchmark 10-year note yields to seven-week peaks, on expectations the Federal Reserve could bump up rates as early as June. Minutes from the last Fed meeting are due Wednesday. Continuación...