There may be cells that were damaged by the stroke but not killed. Function related to those cells may be lost at first but as the cells recover the function can also recover. Dead brain cells do not grow back and new cells generally do not grow to replace brain cells that have been killed.

There is no definitive answer to this question as the research on the matter is still ongoing. However, some studies have suggested that certain types of brain cells may be able to regenerate after a stroke, which could potentially improve recovery. Additionally, different factors such as age and the severity of the stroke may also influence whether or not brain cells can grow back after a stroke. Ultimately, more research is needed to determine exactly what types of brain cells can regenerate after a stroke and how this process occurs.