A study revealing safety and ethical concerns over using animal organs in lifesaving ... altered pigs whose organs would not be rejected by the human immune system could help solve the current ...
Cells are the smallest unit of life. Cells in multicellular plants and animals are arranged into tissues, organs and organ systems. Cells. Tissues. Organs. Organ systems. And the organism itself.
The controversy stems from the daunting immunological barrier to transplanting organs between disparate species and from the possibility that an animal organ or tissue might transmit an infectious ...