The following image shows a simplified overview of the general methods used in regenerative medicine. The step of the cycle evolution of the cell to be treated is identified with a number from
1 to 4. A list of corresponding cell stage associated with such step is next to the image. Write the corresponding number of the step cell stage in the space behind each text line.

- Pluripotent cell.
- Patient.
- Diseased cell type.
- Skin fibroblast.