Mast Cell is an immune cell character in "Cells at Work!" who is responsible for releasing chemicals like histamine and leukotrienes. She causes inflammation to help protect the body from harm but can also trigger allergies when overreacting to harmless things like pollen. Although her name is "Mast Cell," which is sometimes wrongly linked to the word "fat," she has nothing to do with being overweight. Mast Cell is very strict, often clashes with other cells—especially B Cell—and does not like people calling her by certain names. Her job sticks closely to the rules, which sometimes makes things tough for herself and those around her.
Mast Cell is drawn as a beautiful woman with long straight black hair.
She always wears a white lab coat.
She does not appear overweight at all, even though her name may suggest it.
Mast Cell is very serious about her work.
She often acts nervous, panicky, and gets angry easily, making her come across as a little hysterical.
She dislikes being called "Mast Cell" and absolutely hates being called "Hysteria Cell."
Following the manual strictly, she sometimes can't adjust to new situations, which leads to trouble with others.
Mast Cell is a type of immune cell.
Her main job is to release chemicals whenever there is damage to the body, which causes inflammation.
Even though her actions are usually helpful, sometimes they produce effects that bother General Cells, who then complain about her.
The name "Mast Cell" does not come from weight but from the fact that she is stuffed with tiny chemical packets inside.
Mast Cell releases histamine and leukotrienes from her special room.
These chemicals can make blood vessels get wider and tell White Blood Cells about trouble, calling them to the scene.
She plays a big part in causing allergies because she reacts strongly when B Cell makes IgE antibodies to certain things, like Cedar Pollen Allergens.
She can release too much histamine, which can affect even healthy cells and trigger allergic reactions.
Mast Cell has many fights with other cells, especially B Cell.
Their most serious argument happened during an allergy incident with Cedar Pollen Allergen where they blamed each other for what went wrong.
She often comes into conflict with General Cells who complain about the side effects of her job.
The word "Mast" in "Mast Cell" means "grain" or "particle," referring to the little chemical granules inside her.
The "Mast Cell" name made people think of "fatness" because the cell looked stuffed, but it is not linked to body weight at all.
Calling her "Mast Cell" or "Hysteria Cell" will make her extremely angry.
First Appearance and Duties
Mast Cell first appears in episode 2 of "Cells at Work!"
She helps defend the body by releasing histamine and leukotrienes when there’s injury or danger.
She calls White Blood Cells to help clear out threats.
Allergy Incident with B Cell
When B Cell creates IgE antibodies against Cedar Pollen Allergen, Mast Cell responds too strongly by releasing too much histamine.
This causes a big allergic reaction.
General Cells start complaining about the side effects.
Mast Cell and B Cell get into a heated argument trying to decide who is to blame for the allergy problem.
Other Moments
Mast Cell follows her manual and does her best even though it sometimes makes things tough for herself and others.
She has also appeared in the "Cells at Work!" one-shot manga.
Mast Cell is often at the center of scenes involving allergies and inflammation.
She has her own special room for releasing chemical signals in the body.
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