The Department of Health and Human Services, specifically the National Institutes of Health (NIH), intends to award a sole source modification to the University of Washington for the development and maintenance of an Aged Rodent Tissue Bank (ARTB). This modification aims to extend the contract period by 12 months, allowing for the continued collection, storage, and distribution of biospecimens from aged rodent colonies, which is critical for supporting the National Institute on Aging's mission. The services provided under this contract are essential for ongoing research and development in health-related fields, ensuring that there is no interruption in these vital services. Interested parties may express their interest and capability to fulfill this requirement within 30 days of this notice, and should direct inquiries to Robert Bailey at rob.bailey@nih.gov or Brian O'Laughlin at olaughlinb@nida.nih.gov.