Comparison of p17 A. laidlawii with eubacterial sHsps, Hsp20 Methanococcus jannaschii (a), and three predicted α-crystallin-type proteins from Mollicutes (b). AYWB Aster yellows witches’-broom phytoplasma, OY-M Onion yellows phytoplasma (Candidatus Phytoplasma asteris str. AYWB and OY-M). The identical amino acid residues are marked with black. α-Crystallin domain and a putative WDPF motif are framed (a, b). In addition, the WDPF motif is indicated with an arrow (b)