A Laboratory Analysis of Endometrial Regenerative Cells (ERC).Michael Murphy, M.D.Dr. Murphy's team launched a new trial that evaluates a new source of stem cells; A Laboratory Analysis of Endometrial Regenerative Cells (ERC). This study collects menstrual blood. The goal is to develop a sterile laboratory technique for expanding ERCs from a single donor to reach a target population of 1 x108 cells with a normal karyotype. ERC appear to possess numerous advantages compared to other stem cell sources that make them attractive to further investigation. Firstly, the ease of collection of ERC allows for the creation of patient-specific cell banking (holding them back until needed). If the cells behave as expected, they may be expanded (multiplied) and may possess the ability to change into various tissues.