It promotes disentanglement of DNA by reducing the probability of catenation. They feature unbranched sulfur chains, reflecting sulfur's proclivity for catenation. DNA topology is the tertiary conformations of DNA, such as supercoiling, knotting, and catenation. The versatile chemistry of elemental sulfur is largely due to catenation. And type IA topoisomerase can catalyze catenation, decatenation, knotting and unknotting of the DNA. Through catenation, carbon forms a countless number of compounds. The words "to catenate" and "catenation" reflect the Latin root "catena", "chain". This catenation can be visualised as two interlinked rings which cannot be separated. Further catenation is rare, although (isoelectronic with carbonate and nitrate) is known.