Eight types of stem cells in the life cycle of the moss Physcomitrella patens

- At least eight types of stem cells are recognized in the life cycle of the moss Physcomitrella patens.
- We reviewed gene regulatory networks to form each type of stem cells.
- Class 2 KNOX and polycomb repression complex 2 genes inhibit to make stem cells of the other generation.
- Differentiated Physcomitrella patens cells are easily reprogrammed to stem cells.