Costa Rica began testing a similar treatment in humans last week, with the first results expected in a few weeks, according to authorities.

BUENOS AIRES, Argentina—Barcelona star Lionel Messi was left out of the first post-World Cup Argentina squad announced on Friday ahead of four upcoming friendlies.

Argentina's new government began negotiations with hedge fund creditors Monday, amid reports it wants them to write off up to a quarter of their bonds to settle a long-running dispute.

Argentina's President Mauricio Macri said he hoped for a "reasonable agreement" with the country's foreign creditors when he re-launches negotiations over billions of dollars of debt with U.S. investors Wednesday.

Argentina's new conservative government affirmed on Sunday that it will continue to press the country's claims to the Falkland Islands, which Britain insists that it owns.

Poor weather forced the cancellation Sunday of the opening stage of the Dakar Rally across Argentina and Bolivia.

Argentine President Mauricio Macri, in his first trip abroad since assuming office, inserted himself into an international dispute by calling for the release of prisoners in Venezuela that human rights groups say are being held for political reasons.

The Argentine peso lost 30 percent of its value on Thursday after the new pro-business government scrapped the foreign exchange restrictions introduced by its leftist predecessors.

Argentina said Wednesday it will eliminate the foreign exchange restrictions that have propped up the official value of the peso since 2011, setting up a potentially painful devaluation.

BUENOS AIRES, Argentina – Argentina's new President Mauricio Macri was dismissed by rivals as a spoiled elitist, but tapped frustration with the sinking economy to put an end to 12 years of left-wing rule.