A precursor cell that has a tendency to differentiate into a specific type of cell. They are descendants of stem cells, only they are more constrained in their differentiation potential or capacity for self-renewal, and are often more limited in both senses. [ http://openisbn.com/search.php?q=978-1-62808-994-3&isbn=1/ https://doi.org/10.1016/B978-0-12-409503-8.00002-0 ]