| http://www.w3.org/ns/prov#value | - In another embodiment, the kit comprises a known quantity of one or more steroids for use as a standard, for example when detecting steroid levels by liquid chromatography (LC) and/or mass spectrometry (MS).Other items that can be included in a kit include for example reagents to assess cell viability, gene expression and/or enzyme concentrations and activities.Gene expression can be for example,
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