Backwards cap Platelet (Anime)

Backwards cap Platelet (Manga)

 ROMANJI Kesshōban
 ALIASES Backwards cap-kun
(by U-1146, Megakaryocyte, and his colleagues)
 STATUS Active
 SPECIES Platelet Cell
 AFFILIATION Platelet Division
 OCCUPATION Construction Worker
 ANIME DEBUT Episode 1
 MANGA DEBUT Chapter 1

Backwards cap Platelet is a minor character in Cells at Work!. He is often seen together with the platelet leader.

He is less agile compared to other platelets. To overcome this, he likes to train alone.[1]


Despite their size and looks, Platelets play important roles in the body, such as fixing wounds.

  • Overall Abilities: Platelets are powerless against threats. However, they are small and nimble, thus able to move through bacterium to cover up wounds under the protection of white blood cells.
  • Hemostasis: Platelets can aggregate together to close an open wound. They use a protein known as "Von Willebrand Factor" to help them, which functions similarly to super-glue. The "Coagulation Factors" in the blood will work to coat the clot with a net of Fibrin, causing it to solidify.
  • Thrombus (Blood Clot): Platelets are dragging nearby red blood cells and/or white blood cells and binding them with fibrin net to form a plug.


  1. Cells at Work! chapter 26
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