Multiple sequence alignment of PM3 SUN domains and PAD regions. Multiple sequence alignments from ClustalW2 for isolated domains of PM3 proteins from five plant species. Box shade alignment displays show conserved residues (identical black, similar grey) and an alignment consensus sequence at the bottom. (A) Alignment of the SUN domains with amino-acid numbers indicated. (B) Alignment of PAD regions composed of a ~38-amino acid segment.