- Phosphorylation of the cytoplasmic domain of the bovine cation-independent mannose 6-phosphate receptor. Serines 2421 and 2492 are the targets of a casein kinase II associated to the Golgi-derived HAI adaptor complex. Méresse, S., Ludwig, T., Frank, R., Hoflack, B. J. Biol. Chem. (1990)