John Nicholls is in the Department of Pathology, The University of Hong Kong and Malik Peiris in the Department of Microbiology, The University of Hong Kong, Hong Kong, SAR. nicholls@pathology.hku.hk
Two studies show how the enzyme ACE2 protects against lung injury caused by SARS and other agents. ACE2 seems to counteract the effects of ACE, which are more damaging (pages 875−879).
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