Deconvolute non-standard prefixes

The following prefixes show up in various places in UBERON but they are not in the Bioregistry, based on the OQUAT analysis in https://biopragmatics.github.io/oquat/unknowns/source/uberon and https://biopragmatics.github.io/oquat/invalids/source/uberon:

Generated by the following code:

from tabulate import tabulate
from collections import Counter

import requests


def main():
    url = "https://raw.githubusercontent.com/biopragmatics/oquat/main/results/uberon.json"
    data = requests.get(url).json()

    counter = Counter()
    examples = {}
    for data in data["results"].values():
        for key in ["synonym_pack", "prov_pack", "xref_pack"]:
            for prefix, uri_to_value_dict in data[key]["unknown_prefixes"].items():
                counter[prefix] += len(uri_to_value_dict)
                examples[prefix] = list(uri_to_value_dict.items())[0]

    rows = [(prefix, count, *examples[prefix]) for prefix, count in counter.most_common()]

    print(
        tabulate(
            rows, headers=["prefix", "count", "example_node", "example_val"], tablefmt="github"
        )
    )


if __name__ == "__main__":
    main()

Any help figuring out what these are and how they're used would be appreciated!