Mo. Rev. Stat. § 172.630

All moneys and funds now and hereafter held in the seminary fund, or received by or accruing to it, except the interest on the same, shall at all times be invested and reinvested as directed by the board of curators of the state university only in registered bonds of the United States or of the state of Missouri, bonds of school districts of the state of Missouri, or bonds or other securities, the payment of which are fully guaranteed by the United States, at not less than par value.