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.

2024 marked a big year for the field of xenotransplantation, with surgical teams at several health systems completing historic procedures that could pave the way for broader adoption of ...

from the threat of rejection — the animal organs that are used are genetically modified to reduce the risk of an unfavorable rejection by the transplant recipient’s immune system — to the ...