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#General notes on bacterial systematics.  In order to identify to which organism a 16S rDNA sequence belongs, as well as to provide an evolutionary context for your organism of interest, we recommend building a phylogenetic tree (see Section X). Building the phylogenetic tree is the easy part. Intelligent interpretation of the tree will require an investment of time, similar to the investment required to learn the basics of UNIX. Fortunately, there are a number of resources available for this purpose. We recommend this online tutorial (http://evolution.berkeley.edu/evolibrary/article/phylogenetics_02) or thisvery nice  paper by Baldaufhttp://evolution.berkeley.edu/evolibrary/article/phylogenetics_02  this paper:  http://research.cs.queensu.ca/home/cisc875/faint.pdf As with UNIX, we will list some basic terms with which you should make yourself familiar before attempting to make sense of your tree.