Highly proliferative mesenchymal stem cells (MSCs) may be useful for the large-scale and rapid production of a cell preparation, and a cell population may include the mesenchymal stem cells. A cell population may include mesenchymal stem cells derived from a fetal appendage, wherein, in the cell population, the proportion of CD105+ mesenchymal stem cells is 50% or more, the proportion of CD200+ mesenchymal stem cells is less than 10%, and the proportion of CD106+ mesenchymal stem cells is less than 5%.
