Cells

Cells (細胞) are the basic structural, functional, and biological units of all living organisms. Together they form a multicellular organism, thus they are known as the "building blocks of life". However cells are anthropomorphic in Cells at Work! and have their own stories.

There are roughly 37.2 trillion cells in a human body,

Immature Cells
A Progenitor Cell is a newly born cell that has not differentiate into a specific cell type, similar to a baby.