A full document about all built in functions in perl Using CGI Perl Module to writting CGI scripts. There may be tens of thousands of spots on an array, each representing a single gene. Both extracts are washed over the microarray.
Gene sequences from the extracts hybridize to their complementary sequences in the spots.
The dyes enable the amount of sample bound to a spot to be measured from the level of fluorescence emitted when it is excited by a laser. Thus, the relative expression levels of the genes in the sample and in control populations can be estimated from the fluorescence intensities and colours for each spot.