The class All-Genes includes as its subclasses the set of true genes (class Genes), as well as sets of gene-like sequences. The latter includes class Phantom-Genes (sequences that were predicted to be genes by computational gene-finding programs, but that were later determined not to be genes, such as through experimentation), and class Pseudo-Genes. Therefore, to enumerate all true genes in an organism, query the instances of class Genes, not class All-Genes.
a DNA segment
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