MYH3 and Sheldon-hall syndrome: MYH3 mutations have been identified in multiple DA syndromes, including distal arthrogryposis, type 1 (Alvarado et al, 2011), DA2A, and distal arthrogryposis type 2B (DA2B) (also called Sheldon‐Hall syndrome) (Toydemir et al, 2006; Beck et al, 2013).