Identify the Lewis acid in the following reaction. 
Definitions:
Lymphocyte Functioning
The activity and role of lymphocytes, a type of white blood cell, in the immune system to fight infection and disease.
Bereaved People
Individuals experiencing grief and mourning following the death of a loved one, often undergoing a complex process of emotional adjustment.
Blood Samples
Specimens of blood taken for testing or analysis to diagnose illness, monitor health conditions, or perform scientific research.
Neurotransmitter Activity
The action or process by which neurotransmitters are released, bind to receptors, and elicit a response in the nervous system, influencing behavior and mood.
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