The Platelet Division is one of the blood components in the body that is formed by Platelets. They react to and close up bleeding injuries. They also clear blood clots in blood vessels.
Due to their size and strength, they often have difficulties performing simple tasks like unloading cargo and climbing down stairs; therefore, they work in groups to help each other out. They are unable to protect themselves against pathogenic cells; thus they require protection from white blood cells while they respond to emergencies.
The Rules of the Platelet Division During Thrombus 
- Don't get separated! No going off on your own!
- Don't fight amongst yourselves!
- Make sure to use GPIb and stuff so you don't get blown away!
Platelets are small in size, resulting in their uniforms being over-sized on them. Their uniform consists of a blue T-shirt and sand-colored shorts. They also wear black boots with white edges or regular shoes with striped socks and a white cap with '血小板' ('Platelets' in Japanese) printed on it. They have choice in how they wear their uniform, such wearing the cap backward.
- ↑ Cells at Work! Anime, Episode 2