U-1110

 also known as Teacher Neutrophil (好中球先生), is a minor character in Cells at Work!.

Appearance
He has extremely pale skin and hair like the other neutrophils. He wears the standard neutrophil uniform. When he is teaching the Erythroblasts, he takes off the outer coat and ties it around his waist. He has black eyes and appears to be bald.

Background
U-1110 is a Neutrophil working under the Neutrophil Division. His job includes eliminating pathogens that invade the body. In his appearance during a flashback, he acts as a teacher towards the Erythroblasts and acts as a bacterium. He was also U-1146’s and Eosinophil’s teacher.

History
U-1110 is seen helping Macrophage in teaching the Erythroblasts on how to escape and run away from invading bacteria. He takes on the role of a bacteria, chasing the Erythroblasts, acting perfectly like one from his experience with bacteria. Later, when AE3803 goes missing he finds her and U-1146 being bullied by a Pseudomonas Aeruginosa. He immediately kills the bacterium and takes U-1146 back, parting U-1146 and AE3803.