Classification of ESTs according to Gene Ontology. Proportions of expressed sequence tags (EST) classified according to Gene Ontology terms under the root namespaces (molecular function (A), cellular component (B), and biological process (C)) are indicated for each cDNA library. Classification according to Gene Ontology was conducted by using the similarity of the EST assemblies to human genes and the correspondence between genes and the Gene Ontology terms provided in NCBI Gene (ftp://ftp.ncbi.nih.gov/gene/DATA/;). ESTs classified under more than one term in a single namespace are counted redundantly under the respective terms. ESTs not classified under any terms are omitted from this figure.