The UCSF IVF Tissue Bank has been established to provide researchers with the reproductive materials needed to perform several types of infertility, genetic, and general health research. These researchers will use the donated materials to improve understanding of human development, reproduction, and infertility with a goal of improving current treatment options. If donors specifically agree, embryos and gametes (eggs and sperm) may also be used to derive stem cells. This may ultimately lead to the development of treatments that may help those with life-threatening or chronic illnesses overcome their illness or improve their quality of life. Embryos donated to the UCSF IVF Tissue Bank will never be donated to another couple. They will be used for research purposes only.