The NIH RePORTer (Research Portfolio Online Reporting Tools) can be used to locate reports, data, and analyses of NIH Research Projects. The RePORTer website describes the tool:
To provide NIH stakeholders with quick and easy access to basic information on NIH programs, the NIH has created a single repository of reports, data and analyses, along with several tools for searching this database. A common classification scheme based on the traditional NIH budget categories is used to group similar reports. Several different filters can be applied to find information specific to a particular NIH Institute or Center, funding mechanism or topic of interest.
For more information about how to search this comprehensive database, see the FAQ section.