Stem cell immunology is the study of the immune system's response to stem cells, including the recognition and rejection of stem cells that are transplanted from one individual to another. Embryology is the study of the development of an organism from the fertilized egg to the fetal stage. In the field of stem cell research, stem cell immunology and embryology are closely interconnected, as stem cells are derived from embryos and have the ability to differentiate into various cell types. Researchers are studying the immune response to stem cells in order to better understand the mechanisms of rejection and to develop new strategies for preventing rejection, and they are also studying the developmental potential of stem cells in order to understand how they can be used for tissue repair and regeneration by regenerative medicine.