PS1 definitions

PS1

Presenilin-1 (PS1) is a protein produced in brain cells. Inherited mutations of the PS1 gene on chromosome 14 are a cause of Familial Alzheimer's Disease.
Found on http://www.alzresearch.org/glossary.cfm

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ps1

Play Station 1
Found on http://www.noslang.com/dictionary/p/

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