This patent application covers methods of using menstrual blood as a starting population of cells for isolation of numerous progenitor and stem cell subsets. The application includes various criteria for selection of cells that have specific uses. For example, in some embodiments of the invention cells are selected for high ability to make new blood vessels through isolation of populations having CD9 expression. In other embodiments the cells are selected for ability to differentiate into numerous other lineages, these populations are selected based on expression of c-kit. This application is aimed at covering the composition of matter for the starting cellular population found in the menstrual blood.