Figure 3: Sequence alignment of the conserved motifs from fungal ABC transporters. Comparison of the sequence alignment of the walker A, Q-loop, signature C, Walker B, and H-loop motifs of N- and C-terminal NBDs (NBD1 and NBD2) of CaCdr1p with known (a) fungal and (b) nonfungal ABC transporters. Conserved but unique residues are highlighted.