The core entities of a Study (its "keys") are Participants (identified by "Participant IDs") and Time, either Visits (identified by "Visit IDs" or "SequenceNums") or Dates.
Participants appear at planned locations (Sites) at expected points in time (Visits) for data collection. At such Visits, scientific personnel collect Datasets (including Clinical and Assay Datasets) and may also collect specimen samples. This data can all be uploaded or linked to the Study.
Learn more about managing samples in a study in this topic:
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