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The researchers observed that AD mice showed memory deficits in maze tests, but memory was unimpaired in AD mice with genetically reduced PDE4B activity.

The state water board has set a goal of keeping 40% of the total “unimpaired” flow in the three rivers from February through June.

Despite efforts to isolate some political prisoners — Navalny repeatedly complained about failing to receive letters from his wife — and the general secrecy of the penal system, these services have operated unimpaired so far.

Lopez and his colleagues set to change that by examining the relationship between A-beta deposition and new cases of dementia in 94 elderly individuals who were cognitively unimpaired when the study launched.

In its mission, the NPS “preserves unimpaired the natural and cultural resources and values of the National Park System for the enjoyment, education, and inspiration of this and future generations.”