In the face of this threat, scientists have been racing to find the causes&#151;and possible cures&#151;for this devastating disease.
(scientists; have been racing; to find the causes&#151; L:In the face of this threat) Context(scientists have been racing,List([28, 55))):(scientists; have been racing to find; the causes&#151)
scientists have been racing,List([28, 55))
scientists scientists
have been racing have been racing to find
to find the causes&#151 L:In the face of this threat
the causes&#151