The UCSF NIH Human Endometrial Tissue and DNA Bank, established by Principal Investigator Linda C. Giudice, M.D., Ph.D., in 1999, resides at the University of California, San Francisco (UCSF), as a national resource supported by the The UCSF NIH National Center for Translational Research in Reproduction and Infertility (NCTRI). The objectives of the Tissue Bank are to acquire human endometrial tissue and matching blood samples after written informed consent under an IRB-approved protocol and with full HIPAA compliance, process these de-identified specimens and disseminate them for research by investigators supported by NCTRI and other NIH-supported investigators in North America and other collaborators, globally.