According to CNN:
Republican presidential candidate Ben Carson on Thursday defended his past use of tissue from aborted fetuses for medical research even as he continued to criticize Planned Parenthood.
The retired neurosurgeon said his research, which took place in 1992, does not conflict with his call to defund Planned Parenthood after several undercover videos surfaced that purportedly show officials with the organization working with research companies using tissue from aborted fetuses.