Classification of the 4,809 and 883 ESTs from the cambial-region (A) and developing-xylem (B) libraries, respectively. ESTs with blastx scores >100 were classified into functional categories: unknown, with similarity to uncharacterized DNA or protein sequences in existing databases; no hits, no sequence similarity found in existing databases; DNA-binding proteins; hormone synthesis-related proteins; protein synthesis; protein modification, degradation, and targeting; nucleotide and amino acid metabolism; cell wall formation; stress-related proteins; other proteins whose function does not fit into the other categories; cytoskeleton; cell cycle control; signal transduction; and general metabolism.