Mo. Rev. Stat. § 172.340
Should the president, or any professor, instructor or other person holding office in the university, by selection, appointment, contract or engagement of the board of curators, fail to discharge for any length of time his official duties, without having obtained the permission of said board, the salary or compensation of such president, professor, instructor or other person holding office in the university shall cease for the time he shall so fail to discharge his official duties, and no compensation shall be allowed for such time, but if said board shall be satisfied that such president, professor, instructor or other person holding office in the university as aforesaid had good cause for failing to discharge his official duties, then no part of his salary or compensation shall be deducted or withheld on account of such failure.
§ 172.340, RSMo