NDST2 is a bifunctional enzyme catalyzing both N-deacetylation and N-sulfation of glucosamine residues in heparan sulfate (HS) biosynthesis 1. As a non-ubiquitous member of the NDST family, NDST2 produces tissue-restricted HS sequences involved in adaptive behaviors, cognition, and disease vulnerability, distinct from the ubiquitously-expressed NDST1 2. NDST2 uniquely regulates HS chain length; cells overexpressing NDST2 synthesize increased HS amounts through longer polysaccharide chains rather than altered gene transcription 1. The enzyme is required for exosomal release of specific proteins including SDCBP and syndecan. Clinically, NDST2 upregulation associates with hepatocellular carcinoma progression and reduced overall survival; heat-stressed residual HCC cells show elevated NDST2 expression, with knockdown inhibiting cancer growth and invasion 3. NDST2 expression can be increased by butyrate in mast cells, enhancing heparin synthesis and storage 4. Additionally, NDST2 appears as a prognostic biomarker in acute myeloid leukemia 5 and exhibits altered methylation patterns in Parkinson's disease cerebrospinal fluid 6. These findings suggest NDST2's tissue-specific roles extend beyond HS biosynthesis to cancer progression and neurological disease pathogenesis.