Mo. Rev. Stat. § 456.1080
As provided by sections 469.010 to 469.210*, a powerholder may disclaim all or part of a power of appointment, and a permissible appointee, appointee, or taker in default of appointment may disclaim all or part of an interest in appointive property.
(L. 2016 H.B. 1765)
*Section 469.210 does not exist.