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This picture does not depict the more complicated procedures, trial sets, or observational units for our example study, 8325064.

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Observational Unit Identifiers (OBUIDs) are defined by the sponsor to uniquely identify the observational unit within an experimental unit. In this example the sponsor For study 8325064, the applicant chose to define the EUIDs based on trial sets REFIDs at the trial set level with a single character (e.g., A, F, G, R) and OBUIDs chose to define REFIDs at the observational level based on the position location of the each tube in one of multiple exposure/incubation plates (e.g, 6_1 for plate 6, position 1).

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Dataset wrap

Name	relref.xpt

Rowcaps

Rows 1-5:	Show the values for OBUID within the experimental unit identifier, A, for Set A, as defined in the trial set dataset.
Rows 6-8:	Show the values for OBUID within the experimental unit identifier, F, for Set F, as defined in the trial set dataset.
Rows 9-11:	Show the values for OBUID within the experimental unit identifier, G, for Set G, as defined in the trial set dataset.
Rows 12-14:	Show the values for OBUID within the experimental unit identifier, R, for Set R, as defined in the trial set dataset.

For study 8325064, the applicant chose to define the REFIDs at the trial set level on trial sets (e.g., A, F, G, and R) and based on the position of the tube in one of multiple exposure/incubation plates (e.g, 6_1 for plate 6, position 1).

Observational Unit Identifiers (OBUIDs) are defined by the sponsor to uniquely identify the observational unit within an experimental unit. In this example the sponsor chose to define the EUIDs based on trial sets (e.g., F) and OBUIDs based on the position of the tube in one of multiple exposure/incubation plates (e.g, 6_1 for plate 6, position 1)

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Dataset2

tableid	relref.xpt

Row	STUDYID	ASSAYID	SETCD	REFID	PARENT	LEVEL	LVLDESC
1	8325064	Ames	SetA	A		1	TRIAL SET
2	8325064	Ames	SetA	0_1	A	2	OBSERVATIONAL UNIT
3	8325064	Ames	SetA	0_2	A	2	OBSERVATIONAL UNIT
4	8325064	Ames	SetA	0_3	A	2	OBSERVATIONAL UNIT
5	8325064	Ames	SetA	0_4	A	2	OBSERVATIONAL UNIT
6	8325064	Ames	SetA	0_5	A	2	OBSERVATIONAL UNIT
7	8325064	Ames	SetF	F		1	TRIAL SET
8	8325064	Ames	SetF	6_1	F	2	OBSERVATIONAL UNIT
9	8325064	Ames	SetF	6_2	F	2	OBSERVATIONAL UNIT
10	8325064	Ames	SetF	6_3	F	2	OBSERVATIONAL UNIT
11	8325064	Ames	SetG	G		1	TRIAL SET
12	8325064	Ames	SetG	7_1	G	2	OBSERVATIONAL UNIT
13	8325064	Ames	SetG	7_2	G	2	OBSERVATIONAL UNIT
14	8325064	Ames	SetG	7_3	G	2	OBSERVATIONAL UNIT
15	8325064	Ames	SetG	R		1	TRIAL SET
16	8325064	Ames	SetR	18_1	R	2	OBSERVATIONAL UNIT
17	8325064	Ames	SetR	18_2	R	2	OBSERVATIONAL UNIT
18	8325064	Ames	SetR	18_3	R	2	OBSERVATIONAL UNIT

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