Alignment of Arabidopsis NAP and PIR sequences with related proteins in Homo sapiens, D. melanogaster, and C. elegans. A, The amino acid sequence of Arabidopsis NAP aligned with H. sapiens (NAP1), D. melanogaster (HEM-2), and C. elegans (GEX-3) NAP125 proteins. B, The amino acid sequence of Arabidopsis PIR aligned with H. sapiens (PIR121), D. melanogaster (CYFIP), and C. elegans (GEX-2) PIR121 proteins. An asterisk indicates identical amino acid residues in the alignment. A colon indicates conserved substitutions in the alignment. A period indicates semiconserved substitutions in the alignment.