Defective CHSY1 does not transfer GalNAc to chondroitin [GO_0047238]

Catalysis of the reaction: D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP-N-acetylgalactosamine = N-acetyl-D-galactosaminyl-1,4-beta-D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP.

Open Defective CHSY1 does not transfer GalNAc to chondroitin in VFB

VFB Term Json

{
    "term": {
        "core": {
            "iri": "http://purl.obolibrary.org/obo/GO_0047238",
            "symbol": "",
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                "Class"
            ],
            "short_form": "GO_0047238",
            "label": "Defective CHSY1 does not transfer GalNAc to chondroitin"
        },
        "description": [
            "Catalysis of the reaction: D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP-N-acetylgalactosamine = N-acetyl-D-galactosaminyl-1,4-beta-D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan + UDP."
        ],
        "comment": []
    },
    "query": "Get JSON for Class",
    "version": "44725ae",
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            "symbol": "",
            "iri": "http://purl.obolibrary.org/obo/GO_0008376",
            "types": [
                "Entity",
                "Class"
            ],
            "short_form": "GO_0008376",
            "label": "B4GALNT2 transfers GalNAc to Type 2 MSGG to form Sda"
        }
    ],
    "relationships": [],
    "xrefs": [],
    "anatomy_channel_image": [],
    "pub_syn": [
        {
            "synonym": {
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                "label": "N-acetylgalactosaminyltransferase II activity",
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        },
        {
            "synonym": {
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        },
        {
            "synonym": {
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        },
        {
            "synonym": {
                "scope": "has_related_synonym",
                "label": "uridine diphosphoacetylgalactosamine-chondroitin acetylgalactosaminyltransferase II activity",
                "type": ""
            },
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