in the last section, we looked at how to search the GEO dataset for gene expression data associated pancreatic islets from humans with type II diabetes.

From the 'advanced search', we produced a list of possible datasets. We will now look at those datasets in a bit more detail.

We are now about to fall down the rabbit hole...

We will now look at one of the GEO database entries. For this, we will use, what should be (hopefully), the second entry in your returned list of results (the reasons for looking at this entry is because we will be using the data in some later analysis). If you have closed the advanced search window, the entry can be found here - GDS3882.

Notice how the data is interconnected across numerous databases.

Using the information for the database entry, please take the following quiz:

It is possible to find out some further information about the dataset. This can be found out by either looking at the paper associated with the entry or by looking at the GEO Accession Display.

If you have successfully clicked on the GSE25724 link you should now be looking at a screen like this:

Using the information for the accession entry, please take the following quiz:

In this section, we have looked at how to explore the entry for a dataset in the GEO system. Specifically, we have looked at how to:

In the next section we are going to start doing some analysis of the dataset associated with GDS3882, and for this, you will need the reference series identifier for the data - GSE25724.