A method for identifying mRNA molecules present in a sample, and also for quantifying the expression levels of the mRNA molecules. A profile of gene identities and/or expression levels is produced by generating two independent patterns characteristic of the population of mRNA molecules expressed in the sample and analysing these patterns using a combinatorial algorithm. Gene expression by different cell types or of the same cell types under different conditions may be compared. In this way, genes may be identified which play a role in determining various cellular processes and states, including susceptibility to external factors, development, and disease.
METHODS FOR ANALYSIS AND IDENTIFICATION OF TRANSCRIBED GENES, AND FINGERPRINTING.