Examlex
When a T cell and an antigen- presenting cell interact, a specialized contact called an immunological (connection/bond/synapse) forms between them.
Evolutionary Constraints
Limitations on the course or outcome of evolutionary changes; these can be due to physical, genetic, or environmental factors.
Circulatory System
The body system responsible for the transport of blood, nutrients, gases, and wastes throughout the body.
Endocrine Glands
Glands of the endocrine system that secrete hormones directly into the bloodstream, rather than through ducts.
Hormones
Chemical messengers produced by the endocrine glands that are transported by the bloodstream to target organs to regulate physiology and behavior.
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