If stem cells mature into erythrocytes (red blood cells), they will become red blood cells.

Here's a breakdown:

* Stem cells are undifferentiated cells that have the potential to become various specialized cell types.

* Erythrocytes are specialized blood cells responsible for carrying oxygen throughout the body.

Therefore, the maturation of stem cells into erythrocytes is the process of these stem cells differentiating into the specific function of red blood cells.