Transplanting animal tissues and organs into humans is called xenotransplantation. Which of the following is one difference that makes this process problematic?
A. Animal cells produce amino acids that humans do not produce.
B. Animals cells produce proteins foreign to human cells.
C. Human cells can be infected with bacteria found in animal cells.
D. Human cells and animal cells cannot be fused.
E. Animals cells produce sugar that human cells do not produce.
E. Animals cells produce sugar that human cells do not produce.
Research in this area is continuing, but at least two major difficulties make the process problematic. Animal cells produce a sugar that human cells do not, causing a severe immune rejection reaction in humans when animal tissues are transplanted. In addition, scientists have found that human cells can be infected with some viruses that exist in animals.
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