b) Phylogenetic analysis of the 18S and ITS1 rDNA se- quences To identify the nearest phylogenetic neighbors, each partial sequence of 18S and ITS1 rDNA genes from yeast strains TB2-1 and TW1-3, was compared to sequences in the NCBI GenBank database (www.ncbi.nlm.nih.gov) us- ing the homology search tool (blastn) (Altschul et al., 1997). To produce phylogenetic trees, sequences were aligned us- ing the CLUSTAL W multiple sequence alignment program (version 1.81) (Thompson et al., 1994) and edited manually. Alignments were performed using several yeasts that were closely related to yeast strains TB2-1 and TW1-3, based on information obtained using the BLAST search. Phylogenetic trees were constructed using MEGA, version 3.1 (Kumar et al., 2004).