Predicted thioredoxin fold of MtSEO-F1 and AtSEOa. Three-dimensional structure of the potential thioredoxin fold in (A) MtSEO-F1 and (B) AtSEOa predicted with I-TASSER. α-helices are coloured in red, β-sheets in blue and turns in yellow. Comparison of the predicted three-dimensional structures of (C) MtSEO-F1 and (D) AtSEOa (both coloured in red) with tryparedoxin II, aligned with TM-align. The structure of tryparedoxin II is coloured in blue, cysteine residues are highlighted in green.