Amino acid sequences of four PDI proteins among different Leishmania species. Amino acid sequence alignments for PDI52 (a), PDI47 (b), PDI40 (c), and PDI15 (d), among different New World species (L. amazonensis and L. braziliensis) and Old World species (L. major and L. infantum), are shown. Alignments and homology were analyzed with Clustral W bio-soft. The catalytic domains are denoted by solid boxes, and the ER recognizing site by a dashed box. The absent amino acids in the LaPDI52 and LbPDI52 sequences are indicated by dashes. The highly conservative arginine in the PDI family is underlined (Lappi et al. 2004). Gene Data Bank accession numbers for L. amazonensis PDIs are DQ886663, DQ886662, DQ886661, and DQ886660, respectively