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The Dall sheep, Ovis dalli, a mountain sheep of far northern North America, was the subject of one o
Lynx pardinus, the Iberian lynx, is critically endangered, and is the subject of intense conservatio
Continuous positive airway pressure (CPAP) device. The sleeping subject is receiving the benefits of
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
A Subject Prepared for a Night’s Sleep in a Sleep Laboratory
A cerebral angiogram of a healthy human subject.