And as they move within the Golgaparatus, a special enzyme known as phosphotransphrase basically adds up a sporal group onto the mano sugar found on the hydrolytic enzyme and that produces the manos six phosphate. Now, the special thing about this modified sugar molecule found on the hydrolytic enzymes is that it is the marker. It basically dictates exactly where the hydrolytic enzyme will actually end up. So it's the mano six phosphate that acts as the marker that basically is used to direct the hydrolytic enzymes to the lysosomes. And so normally, if this process takes place correctly and the hydrolytic enzymes are actually properly phosphorylated via this process, only then will they actually end up in the lysosomes. And only then will the lysosomes actually be able to carry out their process.