Figure 2

Unique gene classification. Based on BLASTp sequence comparison, A. thaliana and O. sativa unique genes were classified according to the number of homologs in the other species. We named U{1:0} the unique proteins in one species with no homolog in the other one, U{1:1} the unique proteins with only one homolog and U{1:m} the unique proteins with more than one homolog. First, a BLASTp between unique protein in each species and the whole proteome of the other species was used to define U{1:0}, U{1:1} and U{1:m} gene groups. Proofs of transcription (presence of cognate ESTs and/or cDNA) were used for further classification of U{1:0} genes in U{1:0}E (for Expressed) and U{1:0}NE (for No proof of Expression) genes. Red numbers are relative to A. thaliana while green ones are relative to O. sativa.