42 CFR 121.13: Definition of human organ under section 301 of the National Organ Transplant Act of 1984, as amended.

Human organ, as covered by section 301 of the National Organ Transplant Act of 1984, as amended, means the human (including fetal) kidney, liver, heart, lung, pancreas, bone marrow, cornea, eye, bone, skin, intestine (including the esophagus, stomach, small and/or large intestine, or any portion of the gastrointestinal tract) or any vascularized composite allograft defined in § 121.2. It also means any subpart thereof, including that derived from a fetus.