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Ruth L. Kirschstein National Research Service Award (NRSA) for Senior Fellows (F33) F33  
To provide opportunities for experienced scientists to make major changes in the direction of research careers, to broaden scientific background, to acquire new research capabilities, to enlarge command of an allied research field, or to take time from regular professional responsibilities for the purpose of increasing capabilities to engage in health-related research.

For additional information, visit the NCI Grant Activity Codes/Mechanisms webpage.