The Earth is currently experiencing its sixth major extinction event. One million species globally are at risk of extinction in the next few decades, including 27 percent of the world’s mammals, 41 ...

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When a bird's presence in the U.S. only occurs within a U.S. territory such as Puerto Rico, the name of the territory is noted alongside the bird's name. Unless otherwise noted, the species listed ...

Degenerative mitral valve disease is responsible for the syndromes of billowing mitral leaflet, mitral valve prolapse (MVP), floppy mitral valve, and flail leaflet. 1– 6 The pathology of these is ...

The RNA-guided CRISPR/Cas9 system is a powerful tool for genome editing, but its targeting scope is limited by the protospacer-adjacent motif (PAM). To expand the ...