In, molecular genetics, an ORFeome refers to the complete set of open reading frames (ORFs) in a genome. The term may also be used to describe a set of cloned ORFs. ORFs correspond to the coding sequences (CDS) of genes. ORFs can be found in genome sequences by computer programs such as GENSCAN. While this is relatively trivial in bacteria the problem is non-trivial in eukaryotic genomes because of the presence of introns and exons.