US STOCKS-Wall St off session lows as Greece aid deal optimism grows
* IMF says will help Greece if asked, ECB holds call
* Tsipras to present aid proposal at euro zone meet Tuesday
* Aetna falls after Humana deal, other insurers lower
* Energy index leads losses as oil prices fall
* Indexes down: Dow 0.2 pct, S&P 0.29 pct, Nasdaq 0.3 pct (Updates to early afternoon)
By Tanya Agrawal
July 6 (Reuters) - U.S. stocks were lower in early afternoon trading, but were well off their lows earlier on Monday as investors remained optimistic that a deal could be reached to prevent Greece's exit from the euro zone.
Greeks rejected the conditions of a rescue package from creditors on Sunday and the country's finance minister resigned on Monday, removing a major obstacle to any deal. Prime Minister Alexis Tsipras agreed to present an aid proposal at an emergency euro zone meeting on Tuesday.
Stock markets globally fell, but analysts said the declines were less than expected due to expectations that the European Central Bank would act to limit any damage. Continuación...