What anatomy is labeled as letter E in the image below? 
Definitions:
Immune System
The body's defense mechanism against foreign substances and pathogens, comprising various organs, cells, and proteins.
Psychoneuroimmunology
The study of how psychological factors, the nervous system, and the immune system interact to affect health.
Behavioral Medicine
An interdisciplinary field that integrates behavioral, psychosocial, and biomedical knowledge to prevent, diagnose, and treat various health problems.
Mind and Body
The interconnected relationship between mental and physical aspects of an individual's health and functioning.
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