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Briefly describe positive and negative selection of T cells in the thymus.
Brain Damage
Physical harm to the brain that impairs its functions, often resulting from accidents, diseases, or medical conditions.
Tertiary Stage
The third stage of some diseases, marked by severe complications and systemic spread, often after a latent period.
Pituitary Gland
A small endocrine gland located at the base of the brain that produces hormones regulating growth, metabolism, and reproduction.
Ectoderm
The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of skin, nails, hair, and nervous system.
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