PubChem Data Sources

Data TypeLive Substances(444)Live BioAssays(81)Annotations(50)On Hold BioAssays(10)Classifications(7)On Hold Substances(5)

This is confusing. What are the onhold Substance and Bioassays? I will link to this from the article,,
but it seems that data submission using pubchem upload, a data source may have some data on hold, and other data live.

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