Memory Cell
Memory cell black
 ROMANJI Kioku Saibō
 STATUS Active
 SPECIES Lymphocyte Cell
 OCCUPATION Information Keeper
 MANGA DEBUT Chapter 8

Memory B Cell or just commonly known as Memory Cell (記憶細胞 Kioku Saibō?) is a minor character in Cells at Work! BLACK.

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. He wears a polo, slacks and vest, and a tie.


  • 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.
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