PGP21 (P-GLYCOPROTEIN 21); ATPase, coupled to transmembrane movement of substances. Identical to Multidrug resistance protein 17 (MDR17) [Arabidopsis Thaliana] (GB:Q9M1Q9); similar to PGP11 (P-GLYCOPROTEIN 11), ATPase, coupled to transmembrane movement of substances [Arabidopsis thaliana] (TAIR:AT1G02520.1); similar to MDR4/PGP4 (P-GLYCOPROTEIN4), ATPase, coupled to transmembrane movement of substances / xenobiotic-transporting ATPase [Arabidopsis thaliana] (TAIR:AT2G47000.1); similar to PGP12 (P-GLYCOPROTEIN 12), ATPase, coupled to transmembrane movement of substances [Arabidopsis thaliana] (TAIR:AT1G02530.1); similar to CjMDR1 [Coptis japo