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In cytology, a precursor cell, also called a blast cell or simply blast, is a type of partially differentiated, usually unipotent cell that has lost most or all of the stem cell multipotency.
Usually a precursor cell is a stem cell which has the capacity to differentiate into only one cell types. Sometimes precursor cell is used as an alternative term for unipotent stem cells.
A blastoma is a type of cancer created by malignancies of precursor cells.
In embryology, precursor cells are group of cells that differentiate later into one organ.
Precursor cell – Britannica Online Encyclopedia