Upload Experiment Metadata page. A spreadsheet containing clinical and/or demographic "metadata" is uploaded and its contents displayed at the top of the page. In the lower half of the page, one can select which columns of the spreadsheet represent specific "Person" or "Sample" attributes. In this example, Person ID has been specified and the associated attributes are active. Sample ID has not been specified, so those attributes are inactive. Once an attribute has been mapped to a column, the associated Map Values button is activated (see Gender).