Table 1.

List of some biological databases that have incorporated PO to describe and catalog their object types

Database name and website	Materials annotated to PO
Bioassay and Phenotype Database (BAP DB) http://bioweb.ucr.edu/bapdb/	Mutants, genes
BRENDA (The Comprehensive Enzyme Information System) http://www.brenda.uni-koeln.de/	Enzymes
Gramene (A Resource for Comparative Grass Genomics) http://www.gramene.org	Genes, QTLs, proteins
Genevestigator (Microarray Database and Analysis Toolbox) http://www.genevestigator.ethz.ch/	Microarray
IRIS (International Rice Information System) http://www.iris.irri.org	Mutants
MaizeGDB (Maize Genetics and Genomics Database) http://www.maizegdb.org	Genes, Mutants
NASC (Nottingham Arabidopsis Stock Center) http://arabidopsis.info/	Germplasms
Oryza Tag Line http://urgi.versailles.inra.fr/OryzaTagLine/	Mutants
PLEXdb (Plant Expression Database) http://www.plexdb.org	Microarray data
Rice Oligonucleotide Array Project http://www.ricearray.org	Microarray data
SGN (Solanaceae Genomics Network) http://www.sgn.cornell.edu	Genes
TAIR (The Arabidopsis Information Resource) http://www.arabidopsis.org	Genes, germplasms, microarray data
TRIM (Taiwan Rice Insertion Mutants Database) http://trim.sinica.edu.tw/	Mutants