Total ESTs, UniGene transcripts, and Genes in 4 colorectal libraries. The number 1, 2, 3 and 4 in the X-axis stand for total ESTs, validated ESTs that could be clustered in to UniGene, UniGene transcripts and genes, respectively. The exact counts of each category in different states are shown in the Y-axis. Z-axis reflects different status in colon, i.e., normal (N), inflammatory bowel disease (IBD), adenoma (A) and colorectal cancer (T) as indicated by different colours in the figure. This figure implies that the increased ESTs in these libraries might be positively associated with gene redundancy in these profiles.