Hematopoietic stem cells are the cells that form blood and immune cells within the body. Blood Cells are liable for complete maintenance and immune protection of all the cells within the body. These cells grow and mobilize everywhere the blood and undergo apoptosis. These stem cells have the best power of self-renewal of any adult tissue. Open access to the scientific literature means the removal of barriers (including price barriers) from accessing scholarly work. the choice for a researcher is self-archiving (i.e., to publish during a traditional journal, where only subscribers have immediate access, but to form the article available on their personal and/or institutional internet sites (including so-called repositories or archives)), which may be a practice allowed by many scholarly journals.