definition
| - A relation between the target entity of an assay and a material entity, where the material entity is the environment in which the target entity of an assay is measured, such as a live mouse, cell culture, test tube, etc.
- A relation between the target entity of an assay and a material entity, where the material entity is the environment in which the target entity of an assay is measured, such as a live mouse, cell culture, test tube, etc.
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