It is used as a solvent for removing grease and sticky residue. The mechanism involves oxidation of the selenol of a selenocysteine residue by hydrogen peroxide. Monoubiquitination is the addition of one ubiquitin molecule to one substrate protein residue. They always observed a small amount of a dark, insoluble residue. It does so by acetylating the hydroxyl of a serine residue. The bulkier black powder fouling better disperses primer residue. The lipid modification of all Wnts is palmitoleoylation of a single totally conserved serine residue. This had the side-effect of leaving more detergent residue in clothes. This diagram shows the progressive methylation of a lysine residue. This still leaves the problem of non-dissociated petroleum residue. This removed gunpowder residue and made it hard to determine the shooting distance. A glutamate on a nearby loop interacts with nitrogens on the target arginine residue. Glu351 is conserved in mammalian species, which suggests an important function for this residue. There is no French type corresponding to the lowest ash residue in the table. Agricultural waste is common in Mauritius (sugar cane residue) and Southeast Asia (rice husks).