🇺🇸EN
マスト細胞
aka 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)
