A major genetic cause of emphysema is deficiency of the protein alpha-1 anti-trypsin (AAT). AAT is an enzyme that inhibits the activity of another protein. What protein is most likely the normally inhibited target of AAT?
A. hemocyanin
B. myoglobin
C. carbonic anhydrase
D. hemoglobin
E. elastin-specific protease
F. collagen
Answer: E
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