(a) A grantee may not withdraw or spend any part of the endowment fund corpus for a total of 20 years from the end of the project period.

(b) At the end of the 20-year period, during which the endowment corpus must be maintained, the grantee institution is encouraged to preserve the endowment fund corpus but may use the endowment fund corpus for any purpose that expands or develops the institution's minority health and/or health disparities research and/or training capacity.