Which of the cells in the diagram are the first order neurons of the olfactory pathway? 
Definitions:
Activates T Cells
The process involved in stimulating T lymphocytes, a type of white blood cell, to respond to pathogens or infected cells.
Unique
Being the only one of its kind; unlike anything else.
Antigens
Substances that the immune system recognizes and reacts against, often leading to the production of antibodies.
T Cells
A type of lymphocyte that plays a central role in cell-mediated immunity, important for the body's defense against pathogens.
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