Fig. 1From: Defining novel plant polyamine oxidase subfamilies through molecular modeling and sequence analysisRough clustering of the sequence database. A distance tree was obtained by rough clustering using the UPGMA method. The names of the well-documented plant PAOs and characterized enzymes as non PAO are indicated in grey within each clade. A. thaliana Protoporphyrinogen oxidase 1, Prolycopene isomerase, Zeta-carotene desaturase and Phytoene desaturase (AtPPOC, AtCRTSO, AtZDS and AtPDS); S. moellendorffii Prolycopene isomerase and Phytoene desaturase (SlCRTSO and SlPDS); Z. mays Phytoene desaturase (ZmPDS); O. sativa Phytoene desaturase (OsPDS). Grey colored clades correspond to non-PAO groupsBack to article page