The 4-methyl steranes serve as molecular fossils and are used for studying both eukaryotic evolution and geological history. The occurrence of 4α-methyl steranes in sediments has long been considered ...

Methylcobalamin and cyanocobalamin are two forms of vitamin B12. Both provide similar health benefits, but their structures and sources are different.

DNA is subjected to damage from various endogenous and exogenous sources of alkylating agents, resulting in alkylated DNA lesions. Among these lesions, O6-methyl-2′-deoxyguanosine (O6-Me-dG) is highly ...