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  1. xmlghr-summaries.xml 
    https://medlineplus.gov/download/ghr-summaries.xml
    ... acetylcholine. The channels also open in response to nicotine, the addictive substance in tobacco.</html:p><html: ... acetylcholine. The channels also open in response to nicotine, the addictive substance in tobacco.</html:p><html: ...
  2. Excluded References - Diagnosis and Treatment of Clinical Alzheimer’s-Type Dementia: A Systematic Review - NCBI ... 
    https://www.ncbi.nlm.nih.gov/books/NBK556577
    ... of the in vivo brain acetylcholinesterase activity and nicotine binding in galantamine-treated patients with AD. Neurobiology ...