In recent years, scientists have come to rely on freshly obtained human tissue specimens for research and experimentation. Sometimes these tissues and organs can be obtained after routine surgeries like gall bladder removal from adults or foreskin removal during the circumcision of newborns. The use of such tissues and organs can be morally acceptable if the patient (or parents) provide informed consent. The use of cells and tissues from fetuses can also be morally acceptable when those cells are obtained from a natural miscarriage, and the parents provide consent. This would be equivalent to consenting to an organ donation from their deceased child.