The Department of Health and Human Services, specifically the National Institutes of Health (NIH), is seeking qualified small business contractors to perform comprehensive immunohistochemistry analysis of 2,184 mice tissue samples as part of a project aimed at identifying age-associated phenotypic changes in various organs. The objective is to build proteomic signatures of aging outcomes through detailed histological analysis, which includes tasks such as tissue trimming, cassette preparation, paraffin embedding, sectioning, staining, and imaging. This initiative is crucial for advancing the understanding of aging and its effects on health, and the selected contractor will be required to provide progress reports and deliver electronic images and stained slides within one year of sample receipt. Interested parties must submit their capability statements to Rashiid Cummins at rashiid.cummins@nih.gov by April 4, 2025, at 9:00 am Eastern Time, adhering to specified formatting guidelines.