Table 2.

Unstructured metadata fields in GEO.

Field	Description
Title	A unique title that describes the samples.
Source Name	The biological material and the experimental variable(s), e.g., vastus lateralis muscle, exercised, 60 min.
Treatment Protocol	Treatments applied to the biological material prior to extract preparation.
Extraction Protocol	The protocol used to isolate the extract material.
Label Protocol	The protocol used to label the extract.
Hybridization Protocol	The protocols used for hybridization, blocking and washing, and any post-processing steps such as staining.
Description	Any additional information not provided in the other fields.
Data Processing	Details of how data in the matrix table were generated and calculate.

This table lists the unstructured metadata fields along with a description of each element.