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Attributes describe samples. Examples of sample attributes include treatment group, age, sex, and time point. Attributes can be added individually in the data Metadata tab or in bulk using a text file. In this tutorial, we will add one attribute, Treatment5-AZA Dose, manually.

• Click the Metadata tab
• Click Manage under Sample attributes (Figure 1)
  
  

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• Name the attribute To configure a new attribute, at Name, type in 5-AZA Dose as the name of the attribute
• Click Add to add 5-AZA Dose as a categorical, project-specific , categorical attribute (Figure 3)

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SubtitleText Configuring a new attribute AnchorName Configuring attribute
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• Name the first New category 0uMClick Add
• Click the green plus icon to add category (Figure 4)
• Repeat for two additional categories, 5uM and 10uM  (Figure 45)
  
  

• Click Back to data metadata tab 

The data table now includes an Attribute column for 5-AZA Dose (Figure 56). Next, we need to assign samples attribute categories for Treatment5-AZA Dose.

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• Select Assign values

The option to edit the Treatment 5-AZA Dose field for each sample will appear as a drop-down menu (Figure 67).

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• Select the 5-AZA Dose text box for a sample to bring up a drop-down menu with the 5-AZA Dose attribute categories (0uM, 5uM, 10uM)
• Use the drop-down menus to add a treatment group for each sample

The first three samples (SRR592573-5) should be 0uM, the next three samples (SRR592576-8) should be 5uM, and the final three samples (SRR592579-81) should be 10uM (Figure 78).

• Click Apply changes
  
  

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