Abuur nooc ka sii adag weedhan Arsenic, chromium, iron, iyo nickel ayaa laga yaabaa inay la xiriiraan soo saarista noocyada oksijiinta falcelinta leh, qaarkoodna waxay sidoo kale badali karaan daacadnimada nuqulka DNA.
Dabcan, nooca jumlada ee ka adag waa "Arsenic, chromium, iron, iyo nickel waxay la xiriiri karaan soo saarida noocyada oksijiinta falcelinta leh, nickel sidoo kale waxay la xiriiri kartaa DNA hypermethylation iyo histone deacetylation, halka cadmium ay joojin karto dayactirka qaladka DNA".