Show the reaction of allopurinol with xanthine dehydrogenase and explain how this molecule functions as an inhibitor of the enzyme. 
Definitions:
Freud's Research
The pioneering work in psychoanalysis by Sigmund Freud, focusing on unconscious desires, childhood experiences, and personality development.
Early Relationships
The initial social connections and attachments an individual forms, particularly in early childhood, which can significantly impact their social and emotional development.
Heredity
The passing on of physical or mental characteristics genetically from one generation to another.
Psychosocial Theory
A framework that explains development throughout the lifespan as a series of stages, each defined by a specific crisis or challenge.
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