This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
All of the following stem cell populations are found within the hone marrow, except- 
Select and explain. 
A. Endothelial Progenitor cells, B. Myoblast Progenitor cells, C. Mesenchymal stern cells, D. Hernatopodic stkem cells
B: Myoblast Progenitor cells
Answer: B: Myoblast Progenitor cells 
Explanation: Answer is option 2, myoblast progenitor cells. Embryonic myogenesis in veebrates is initiated by specific muscle progenitor cells that reside in the myotome. In mice, these events take place around embryonic day 8 concomitant with the expression of Myf5 by myogenic progenitor cells.1-3 In post-natal muscle, myogenesis is driven by the expression of Pax3 and Pax7 by muscle satellite cells that normally reside just below the basal lamina in the stromal compament in direct contact with the myofiber.