Document the menu on the home page.

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   <div class="explainer">
     <p>Welcome to the <strong>GeneNetwork Data Quality Control and Upload System</strong>. This system is provided to help in uploading your data onto GeneNetwork where you can do analysis on it.</p>
 
-    <p>Click on the menu items on the left to select the kind of data you want to upload.</p>
+    <p>The sections below provide an overview of what features the menu items on
+      the left provide to you. Please peruse the information to get a good
+      big-picture understanding of what the system provides you and how to get
+      the most out of it.</p>
 
     {%block extrapageinfo%}{%endblock%}
+
+    <h2>Species</h2>
+
+    <p>The GeneNetwork service provides datasets and tools for doing genetic
+      studies &mdash; from
+      <a href="{{gn2server_intro}}"
+         target="_blank"
+         title="GeneNetwork introduction — opens in a new tab.">
+        its introduction</a>:
+
+      <blockquote class="blockquote">
+        <p>GeneNetwork is a group of linked data sets and tools used to study
+          complex networks of genes, molecules, and higher order gene function
+          and phenotypes. &hellip;</p>
+      </blockquote>
+    </p>
+
+    <p>With this in mind, it follows that the data in the system is centered
+      aroud a variety of species. The <strong>species section</strong> will
+      list the currently available species in the system, and give you the
+      ability to add new ones, if the one you want to work on does not currently
+      exist on GeneNetwork</p>
+
+    <h2>Populations</h2>
+
+    <p>Your studies will probably focus on a particular subset of the entire
+      species you are interested in &ndash your population.</p>
+    <p>Populations are a way to organise the species data so as to link data to
+      specific know populations for a particular species, e.g. The BXD
+      population of mice (Mus musculus)</p>
+    <p>In older GeneNetwork documentation, you might run into the term
+      <em>InbredSet</em>. Should you run into it, it is a term that we've
+      deprecated that essentially just means the population.</p>
+
+    <h2>Samples</h2>
+
+    <p>These are the samples or individuals (sometimes cases) that were involved
+      in the experiment, and from whom the data was derived.</p>
+
+    <h2>Genotype Data</h2>
+
+    <p>This section will allow you to view and upload the genetic markers for
+      your species, and the genotype encodings used for your particular
+      population.</p>
+    <p>While, technically, genetic markers relate to the species in general, and
+      not to a particular population, the data (allele information) itself
+      relates to the particular population it was generated from &ndash;
+      specifically, to the actual individuals used in the experiment.</p>
+    <p>This is the reason why the genotype data information comes under the
+      population, and will check for the prior existence of the related
+      samples/individuals before attempting an upload of your data.</p>
+
+    <h2>Expression Data</h2>
+
+    <p class="text-danger">
+      <span class="glyphicon glyphicon-exclamation-sign"></span>
+      <strong>TODO</strong>: Document this &hellip;</p>
+
+    <h2>Phenotype Data</h2>
+
+    <p class="text-danger">
+      <span class="glyphicon glyphicon-exclamation-sign"></span>
+      <strong>TODO</strong>: Document this &hellip;</p>
+
+    <h2>Individual Data</h2>
+
+    <p class="text-danger">
+      <span class="glyphicon glyphicon-exclamation-sign"></span>
+      <strong>TODO</strong>: Document this &hellip;</p>
+
+    <h2>RNA-Seq Data</h2>
+
+    <p class="text-danger">
+      <span class="glyphicon glyphicon-exclamation-sign"></span>
+      <strong>TODO</strong>: Document this &hellip;</p>
   </div>
 </div>