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In this April 29, 2016, file photo Pope Francis shakes hands with Vice President Joe Biden as he takes part in a congress on the progress of regenerative medicine and its cultural impact, being held in the Pope Paul VI hall at the Vatican. (AP Photo/Andrew Medichini, File)
In this April 29, 2016, file photo Pope Francis shakes hands with Vice President Joe Biden as he takes part in a congress on the progress of regenerative medicine and its cultural impact, being held in the Pope Paul VI hall at the Vatican. (AP Photo/Andre