Add download instructions

tanghaibao · Jul 28, 2018 · 6324cb7 · 6324cb7
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diff --git a/doc/images/NCBI_gene_download.png b/doc/images/NCBI_gene_download.png
diff --git a/doc/md/README_NCBI_gene.md b/doc/md/README_NCBI_gene.md
@@ -1,26 +1,38 @@
 # NCBI GeneID and Symbol
 Example of printing gene symbols (instead of geneids) from NCBI gene in a GOEA results table.
 
-1. Download NCBI gene information into gene_result.txt
-2. Convert gene_result.txt file into Python 
-3. Create a geneid2symbol.txt ASCII file
-4. Run GOEA using --id2name flag
+1. [Download NCBI gene information into gene_result.txt](#1-download-ncbi-gene-information-into-gene_resulttxt)
+2. [Convert gene_result.txt file into Python](#2-convert-gene_resulttxt-file-into-python)
+3. [Create a geneid2symbol.txt ASCII file](#3-create-a-geneid2symboltxt-ascii-file)
+4. [Run GOEA using --id2name flag](#4-run-goea-using---id2name-flag)
 
 ## 1) Download NCBI gene information into gene_result.txt
+
+  * 1a) [Search for a gene set]()    
+  * 1b) [Download gene_result.txt]()    
+
+### 1a) Search for a gene set
+
  * Go to NCBI Gene in your browser https://www.ncbi.nlm.nih.gov/gene/
  * Type a search pattern and hit the "Search" button.    
    For example, to download all human protein-coding genes:
 ```
 genetype protein coding[Properties] AND "9606"[Taxonomy ID] AND alive[property] 
 ```
+![NCBI Gene Search](/doc/images/NCBI_gene_search.png)
 
     | NCBI Search text                    | Description
     |-------------------------------------|----------------------
     | genetype protein coding[Properties] | Protein-coding genes
     | "9606"[Taxonomy ID]                 | human
     | alive[property]                     | NOT obsolete
 
-![NCBI Gene Search](/doc/images/NCBI_gene_search.png)
+### 1b) Download gene_result.txt
+  * Click pull-down menu: "Send to:"    
+  * Click "File" radial button    
+  * Click "Create File" button    
+![NCBI Gene Download](/doc/images/NCBI_gene_download.png)
+
 
 ## 2) Convert gene_result.txt file into Python 
 ## 3) Create a geneid2symbol.txt ASCII file