string: As shown in Figure 6, the Arabidopsis PXA1 protein resembles two yeast peroxisomal ABC transporters (Pxa1p/Pat2p/Pal1p and Pxa2p/Pat1p; Shani et al., 1995; Hettema et al., 1996; Shani and Valle, 1996; Swartzman et al., 1996) and four human transporters (PMP70/PXMP1, P70R, ALDP, and ALDRP; Gärtner et al., 1992, 1998; Kamijo et al., 1992; Mosser et al., 1993; Lombard-Platet et al., 1996; Holzinger et al., 1999).