Multiple choice Which of the following processes takes place in cis-cisterna with the cargo proteins? Removal of mannose residues and addition of N-acetylglucosamine Addition of galactose and sialic acid Removal of mannose residues Sulfation of tyrosines and carbohydrates Reveal answer Fill a bubble to check yourself C Correct answer Explanation Cis cisterna are associated with the removal of mannose residues. Apart from it, phosphorylation of oligosaccharides on lysosomal proteins occurs in the early CGN.