Figure 4

Molecular phylogenetic tree of Botryococcus braunii wild strains based on 18 S ribosomal RNA sequences. The tree is rooted on the branch between Choricystis and Botryococcus. Numbers around the internodes indicate bootstrap values in the Neighbourhood-joining analysis (1000 replications). Reference sequences are in bold with accession numbers and classification of chemical race (A, B, L, S). The geographic location of isolation sites is also indicated.