Expression profiles of genes belonging to the Gene Ontology term "extracellular matrix" (ID 5578). Clones with similar gene names that belong to the same contig (ensemble of clones with overlapping sequences) but displayed very different expression profiles were excluded from the table (when the expression profiles were not too different the gene symbol are marked with an asterisk). Clones with similar gene names and belonging to different contigs were annotated as gene symbol_1 and gene symbol_2 as they could be considered as potentially duplicated genes or differential splicing forms. The 15 different contigs with homologies to zona pellucida protein homologs (zp2, zp3 and zp4 genes that are highly represented in clusters 1 to 5 have been removed from that table). KM: K-means cluster number. N: number of genes belonging to the GO term in the specified cluster.