MUTATIONAL ANALYSIS OF THE CATION-INDEPENDENT MANNOSE 6-PHOSPHATE INSULIN-LIKE GROWTH-FACTOR-II RECEPTOR - A CONSENSUS CASEIN KINASE-II SITE FOLLOWED BY 2 LEUCINES NEAR THE CARBOXYL-TERMINUS IS IMPORTANT FOR INTRACELLULAR TARGETING OF LYSOSOMAL-ENZYMES (VOL 268, PG 22338, 1993)