Amino-acid sequence alignment of the reactive centre loop (RCL) sequences of putative orthologues of OsSRP-PLP in several grass species. BLAST-P searches of the non-redundant database at NCBI were conducted with the full-length OsSRP-PLP as the query sequence (09 Dec 2011). Accession numbers for the non-rice serpins are given in brackets after the species name. The RCL sequence of OsSRP-LRS is included for comparison. Refer to Figure 1 for residue colour code.