The National Center for Genetic Resources Preservation maintains genetic diversity of crops and livestock. It began in the 1890s with plant introduction stations and expanded over time. Today it preserves seeds and clonal materials through cold storage and cryopreservation. Its collections include over 15,000 accessions of corn and over 59,000 accessions of wheat. Researchers worldwide can access germplasm information and samples. The center helps ensure availability of genetic resources in the face of threats like climate change and diseases.