Unlike most other mammals, cats can not convert β - carotene to vitamin A, because they lack the intestinal dioxygenase enzyme necessary for β - carotene cleavage. (merckvetmanual.com)
In this study, we show that ALKBH1 is a histone dioxygenase that acts specifically on histone H2A. (cmbn.no)
Crystal structure of a member of a novel family of dioxygenases (PF10014) reveals a conserved cupin fold and active site. (jcsg.org)