Mo. Rev. Stat. § 1.485: Severability clause.

If any provision of sections 1.410 to 1.485 or the application thereof to any person or circumstance is held invalid, such determination shall not affect the provisions or applications of sections 1.410 to 1.485 that may be given effect without the invalid provision or application, and the provisions of sections 1.410 to 1.485 are severable.