Examlex
How many amendments have been added to the Constitution?
Photoperiod
The duration of daylight in a 24-hour period, influencing biological processes in organisms.
Pineal Gland
A small, pine cone–shaped structure that projects from the epiphysis of the diencephalon; produces melatonin; also called pineal body.
Thymosin
A hormone produced by the thymus gland that plays a role in the maturation of T cells involved in the immune response.
Immune System
The body's defense mechanism against pathogens, including both innate and adaptive immune responses.
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