Mo. Rev. Stat. § 9.149: PKS day designated for December 4.

December fourth shall be designated as "PKS Day" in Missouri. Pallister-Killian Mosaic Syndrome, commonly known as Pallister-Killian Syndrome or PKS, is a disorder usually caused by the presence of an abnormal extra chromosome and is characterized by vision and hearing impairments, seizure disorders, and early childhood intellectual disability, distinctive facial features, sparse hair, areas of unusual skin coloring, weak muscle tone, and other birth defects. It is recommended to the people of the state that this day be appropriately observed by participating in awareness and educational activities on the symptoms and impact of Pallister-Killian Syndrome and to support programs of research, education, and community service.