cDNA clones of differentially expressed mRNAs in a colon carcinoma have been isolated by subtractive cDNA cloning. The substracted material was at least 90x enriched for differentially expressed sequences and can be used for the construction of substractive cDNA libraries and polymerase chain reaction (PCR) amplification to generate differential probes. In this way rare mRNA (less than 0.1% abundance) which are differentially expressed, can be isolated utilising this procedure. A cDNA clone which we call IH12 has been isolated. Its mRNA is expressed exclusively in actively proliferating cells.
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