"Thymocytes" (胸腺細胞 Kyōsen Saibō?) is the 9th episode of the Cells at Work! anime adaption. It is based on the twelfth chapter of the manga, which has the same title.
- After Helper T Cell "requests" to trade places with Killer T, the camera focuses on both characters. During that shot, the three yellow stars on Helper's black epaulettes are missing.
- When Dendritic Cell taking the book from the shelf, the camera focuses on his arm. During that shot, his arm is passing through the bookshelf's lid.
- When the Naïve T cells heavily panted, they supposedly said 'Yes Sir.' But their mouths did not move as if they were speaking.
- When the Naïve cells did pull-ups on a bar, they had their fingers facing them, however, effector T cell had his grip facing the other direction.