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Casey Dunn committed eddc1d5

minor readme updates...

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 	# 366809 node tree:
 	python itis_sql_to_json.py taxonomic_units strippedauthor 202423 > animalia.json
 
-To examine these trees, replace 'siphonophorae.json' in force/force.html with 
-the name of the new file generated above. Also, don't forget to chmod 755 your 
-files.
+To examine these trees, replace `siphonophorae.json` in `force/force.html` with 
+the name of the new file generated above. Also, don't forget to `chmod 755` your 
+files. To make subtrees for any other group of taxa, search the 
+`taxonomic_units` file for the name of your taxon, and then pass the root 
+id to `itis_sql_to_json.py` as for the other clades above.
 
 
 ## Files
 
-itis_sql_to_json.py - parses taxonomic data from itis.gov into a tabular tree 
+`itis_sql_to_json.py` - parses taxonomic data from itis.gov into a tabular tree 
 encoded in json. Each node has an associated date. For tips, the date is the 
 year in which the species was described. For internal nodes, it is the year 
 that the youngest descendent species was described. The json file is in a 
 simplest way to get a tree with hundreds of thousand of tips for working on 
 large visualization projects.
 
-force - a d3 tree viewer. It can read the json files, including those produced 
-by itis_sql_to_json.py
+`force/` - a d3 tree viewer. It can read the json files, including those 
+produced by `itis_sql_to_json.py`
 
 ## Background