deletions | additions       diff --git a/Phylogenetic networks.tex b/Phylogenetic networks.tex  index 1d26fd6..1727aba 100644  --- a/Phylogenetic networks.tex  +++ b/Phylogenetic networks.tex 
...
\section{Phylogenetic networks}  A phylogenetic network is a connected  graph representing the evolution and relationship between different taxa where terminal nodes are associated with biological species ou sequences.  (including biological species) They can do so  either explicitly or implicitly \cite{Huson_Scornavacca_2011}. It is important to note this distinction, since abstract networks (also called "data visualization graphs") do not always take into account the evolutionary constraints, therefore making them ill suited for the study of biological phenomena, but still can provide some insight by displaying the data in a differently meaningful way.  Another distinction (that also applies for phylogenetic trees) is whether the network is rooted or unrooted.   A rooted tree is a connected and directed acyclic graph where the root of the tree relates to the most ancient common ancestor of the represented species, whereas the unrooted tree only explains how species are related to each other.     There are other means of classifying networks, depending on reconstruction data : from sequences, clusters, distances, trees or splits.