The GNPTG gene codes instructions for making the gamma subunit of an enzyme called GlcNAc-1-phosphotransferase (also called N-acetylglucosamine-1-phosphate transferase).
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Lysosomes, a part of an animal cells, helps break down large molecules into smaller ones that can be reused.
In melanocytic cells GNPTG gene expression may be regulated by MITF.