Figure 3: Phylogenetic tree, alignment and clustering. (A) ClustalX phylogenetic tree analysis of the 92 bp DNA sequences from 19 different clones. (B) DNA sequence alignment. ClustalX alignment of the 92 bp sequences for the DNA sequences in the 11th SELEX round pool illustrated five families of sequences emerge that have 90% sequence identity within each family. Common nucleotides in all families are denoted with an asterisk. SELEX, systematic evolution of ligands by exponential enrichment.