0a1cd358605c0737979f9bc735ab6bfb67196045
jnavarr5
  Fri Sep 6 12:44:30 2019 -0700
Restructuring an introductory paragraph for the history.html page, refs #20314

diff --git src/hg/htdocs/goldenPath/history.html src/hg/htdocs/goldenPath/history.html
index d6186c7..01af301 100755
--- src/hg/htdocs/goldenPath/history.html
+++ src/hg/htdocs/goldenPath/history.html
@@ -22,37 +22,38 @@
   <li><a href="#primer">UCSC Genome Research Primer</a></li>
     <ul class="gbsNoBullet">
       <li><a href="#comparative">Comparative Genomics</a></li>
       <li><a href="#health">Possibilities for Health</a></li>
     </ul>
 </ul>
 
 <a name="overview"></a>
 <h2>Genome Browser Overview</h2>
 <p>
 The UCSC Genome Browser is a web-based tool serving as a multi-powered microscope that allows
 researchers to view all 23 chromosomes of the human genome at any scale from a full chromosome down
 to an individual nucleotide. The browser integrates the work of countless scientists in laboratories
 worldwide, including work generated at UCSC, in an interactive, graphical display.</p>
 <p>
-Zoomed out, the coarse-level view shows early chromosome maps as determined by electron microscopy,
-then the browser drills down to levels of increasing detail, focusing first on chromosome bands,
-then on gene clusters (showing known genes-mostly those linked to diseases), then single genes, then
-the components of genes, and finally on the nucleotides-the As, Cs, Gs, and Ts that make up the
-genome alphabet. Not only does the browser show the genome sequence, but it also delineates known
-areas of the genome and offers supplementary information about the genes-in effect, providing the
-word breaks and punctuation.</p>
+Zoomed out, the coarse-level view of the genome shows early chromosome maps as determined by
+electron microscopy, then the browser drills down to levels of increasing detail, focusing first on
+chromosome bands. The next level detail zooms in on gene clusters, showing known and predicted genes
+near one another on the chromosome. Zooming in further to view a single gene shows the components of
+genes, the introns and exons. Finally, the browser allows researchers to view the nucleotides-the
+As, Cs, Gs, and Ts that make up the genome alphabet. Not only does the browser show the genome
+sequence, but it also delineates known areas of the genome and offers supplementary information
+about the genes-in effect, providing the word breaks and punctuation.</p>
 <p>
 Genome sequences are difficult to read because they consist of letter strings with no breaks or
 punctuation. The example below contains 7 different letters (genomes contain only 4). Can you
 understand what it is saying? (Line borrowed from the movie, <em><a href =
 "https://en.wikipedia.org/wiki/Charly" target = _blank>Charly</a></em>.)</p>
 <pre>
 THATTHATISISTHATTHATISNOTISNOTISTHATITITIS</pre>
 <p>
 With word breaks and punctuation, it starts to make sense:</p>
 <pre>
 THAT THAT IS, IS. THAT THAT IS NOT, IS NOT. IS THAT IT? IT IS!</pre>
 <p>
 The UCSC Genome Browser group played a pivotal role in bringing this extraordinary life script into
 the light of science. The browser presents both experimentally validated and computer-predicted
 genes along with dozens of lines of evidence that help scientists recognize the key features of