S1 Fig. Evolutionary analyses of 52 strains of B. anthracis based on 29906 chromosomal SNPs.

S1 Fig. Evolutionary analyses of 52 strains of B. anthracis based on 29906 chromosomal SNPs. Phylogenetic relationships were inferred using the Maximum Likelihood method (A), the Maximum Parsimony method (B), the Neighbor-Joining method (C) and the UPGMA method (D). Bootstrap values (100 iterations) higher than 70% are shown next to the branches. All evolutionary analyses were conducted in MEGA6 [28]. The maximum likelihood tree with the highest log likelihood (0.000) is shown in A. Tree #1 out of 2 most parsimonious trees (length = 7469, consistency index = 0.815, retention index = 0.947) is shown in B. The optimal neighbour-joining tree with the sum of branch length = 0.251 is shown in C. The optimal UPGMA tree with the sum of branch length = 0.239 is shown in D. The later tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree.

S1图。针对52株炭疽芽孢杆菌（Bacillus anthracis），基于29906个染色体单核苷酸多态性（Single Nucleotide Polymorphisms, SNPs）开展进化分析。本研究采用最大似然法（Maximum Likelihood）、最大简约法（Maximum Parsimony）、邻接法（Neighbor-Joining）与非加权组平均法（Unweighted Pair Group Method with Arithmetic Mean, UPGMA）四种方法推导系统发育关系，结果分别展示于面板A至D。经100次迭代的自举检验中，置信度高于70%的自举值标注于各分支旁侧。所有进化分析均通过MEGA6软件完成[28]。面板A展示了对数似然值最高（0.000）的最大似然树。面板B展示了2棵最简约树中的第1棵（树长=7469，一致性指数=0.815，保留指数=0.947）。面板C展示了最优邻接树，其分支总长度为0.251。面板D展示了最优UPGMA树，其分支总长度为0.239。该树按比例绘制，分支长度与用于推断该系统发育树的进化距离单位保持一致。