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Scientists are making final preparations to retrieve a capsule from a Japanese space probe that went to collect sand from an asteroid.

Japan's space agency, JAXA, launched Hayabusa2 in 2014. It has twice landed on an asteroid called Ryugu about 340 million kilometers from Earth.

A group of Japanese researchers says it has succeeded in creating a functional "mini heart," using embryonic stem cells from a mouse.

The group at Tokyo Medical and Dental University, led by Professor Ishino Fumitoshi, cultivated the ES cells by adding a special protein called laminin.