Multiple sequence alignment of <i>a</i>-type domains of <i>B. distachyon</i> PDI and PDI-like proteins and a typical rice PDI.

<p>These thioredoxin-like domains of the <i>B. distachyon</i> were annotated in Phytozome database, and comparative analysis used BioEdit software. Residues highlighted in deep blue and green show they were identical and similar, respectively. Open bars and arrowheads represent the α helices and β strands, respectively. The red box indicates the -CxxC- catalytic site, and red arrows indicate the glutamicacid–lysine charged pair. Blue and yellow arrows represent the conserved arginine (R) and the <i>cis</i> pralines (P) near the active site, respectively.