Human ES cell research under fire

WASHINGTON, United States - Photo shows researchers Masahito Tachibana (L) and Shoukhrat Mitalipov of Oregon Health and Science University, pictured in Beaverton, Oregon, on May 16, 2013. Their report on the creation of cloned human embryonic stem cells, published in the U.S. scientific journal Cell on May 15, 2013, has come under fire for containing errors.