Fig. 2

a Exon/intron organization of V₀ V-ATPase subunit a in the genome of S. pistillata. Exons are represented as boxes, whereas introns are depicted as lines. b Sequence comparison of S. pistillata and H. sapiens V₀ V-ATPase subunit a. Identical and similar amino acids (aa) are shaded in black and grey, respectively. The boxes represent the predicted transmembrane segments in H. sapiens V₀ V-ATPase subunit a. The circles and crosses represent phosphorylation and N-glycosylation sites, respectively, in spiH_vCN1.1 and spiH_vCN1.2. The asterisk indicates a conserved R relevant to H⁺ transport