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Definition: Haematopoietic Progenitor Cells (HPCs) are best known as stem cells, that give rise to all the blood cell types - white cells, red cells and platelets.
Definition: A progenitor cell is a biological cell that, like a stem cell, has a tendency to differentiate into a specific type of cell, but is already more specific than a stem cell and is pushed to differentiate into its "target" cell.