8. The method of sequencing of claim 1 , wherein the cDNAs are made by the following process: (i) pooling a plurality of samples to make a pooled sample; and (ii) selecting tagged cDNAs from the pooled sample, wherein the tagged cDNAs correspond to one or more genes, thereby producing the plurality of cDNAs that are sequenced.
8. The method of sequencing of claim 1 , wherein the cDNAs are made by the following process: (i) pooling a plurality of samples to make a pooled sample; and (ii) selecting tagged cDNAs from the pooled sample, wherein the tagged cDNAs correspond to one or more genes, thereby producing the plurality of cDNAs that are sequenced. 9. The method of sequencing of claim 8 , wherein the selecting is done by hybridization to a probe that is immobilized to a solid support.