Character

Mast Saibou

マスト細胞, Fat Cell, Mast Cell, Himansaibou

She is a white blood cell, specifically a Mast Cell (mastocyte or labrocyte). As a part of the immune system, she releases chemicals such as histamines and leukotrienes as a stimulus to excess production of IgE (Immunoglobulin E, an antibody produced by B Cells).

(Source: Cells at Work Wiki)

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