A sequence of DNA that resembles a gene but is non functional and cannot be transcribed. It could be the remnant of a once-functional gene that has accumulated mutations.

faulty replicates of normal genes that normally occur in a genome which are stable, inherited, but are unexpressed components of the human genome.

DNA segments in the cell nucleus with nucleotide sequences similar to coding sequences of known functional genes. They are not expressed as proteins. Processed pseudogenes do not have introns or most non-coding control sequences.

genes which once coded for a protein but are mutated and no longer work. Sort of a vestigial gene. Can be a duplicated gene, one copy of which works and one which does not work.

Genes which have homologous structures to other genes but which are incapable of being expressed, e.g. Jk3 in the mouse.