deletions | additions       diff --git a/General notes on bacterial systematics.md b/General notes on bacterial systematics.md  index e8e7c7e..a3da6cc 100644  --- a/General notes on bacterial systematics.md  +++ b/General notes on bacterial systematics.md 
...
#A brief introduction to phylogeny and 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). 11).  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 this paper by Baldauf http://research.cs.queensu.ca/home/cisc875/faint.pdf. Here we provide a brief introduction to phylogenetic trees. A phylogenetic tree is a diagram representing a model of evolutionary relationships. Phylogenetic trees have three main components: taxa, branches, and nodes. These are defined below: