|ANIME DEBUT||Episode 5|
|MANGA DEBUT||Chapter 2|
Memory B Cell or just commonly known as Memory Cell (記憶細胞 Kioku Saibō?) is a minor character in Cells at Work!.
He is a white blood cell, specifically a Memory Cell (B Lymphocyte). Unlike other white blood cells he does not engage in any combat; he records all the information of the past antigens that invaded so the immune system will be prepared when the same threats invade again.
He is an average-looking cell with black messy hair and eyes. He wears a black polo, grey slacks and vest, and a purple tie.
Despite having a good memory capacity, he is often troubled when remembering things, as he is scatterbrained and constantly overthinking, thus making it difficult for him to do his job properly. He has a negative mindset and panics most of the time whenever an invasion occurs.
- Overall Abilities: He remembers antibodies so the immune system knows how to respond to an invader when it strikes again. He usually works together with B Cell for his antigens.
- Allergic Reaction: He also refers to data passed down through genetics, which could lead to an overreaction toward harmless invaders, thus an allergy.
- Acquired Immunity: The main principal vaccines are based on. After encountering a type of virus in the past, the body becomes permanently immune to the virus because the Memory Cell knows how to deal with it.