High sequence identity in a portion of the Lpa1 homologs from maize, soybean, and Arabidopsis. Alignment of a portion of the predicted protein structure for Lpa1 (Glyma03 g32500.1), Lpa2 (Glyma19 g35230.1), AtMRP5 (AT1G04120.1), and maize MRP5 (GI:162464191). Arrow and underline at position Lpa1 894 in alignment represents location of effect of the lpa1-a nonsense mutation (R894STOP). Second arrow and underline at position 1039 of Lpa2 indicates residue affected by lpa2-a and lpa2-b mutations. lpa2-a results in an R1039K change, while lpa2-b results in a R1039STOP change. Identical residues are indicated by white background with black text. Gaps and nonsimilar amino acid substitutions are indicated by black background with white text. Similar amino acid substitutions are indicated by light gray background with black text, and weakly similar substitutions are indicated by white text and dark gray background. The alignment before 701 is not shown due to space limitations, but mutant alleles do not differ from the ‘Williams 82’ gene models before residue 664 (Lpa1) or 493 (Lpa2).