Figure 1From: Diversity of pneumococcal surface protein A (PspA) among prevalent clones in SpainPhylogenetic tree of a 373-bp region that includes psp A clade-defining region. Phylogenetic and molecular evolutionary analyses were conducted with the MEGA4 program (version 4.1) [36] by the Neighbor-Joining method. Only bootstrap confidence intervals exceeding 90% are shown.Back to article page