Method for identifying human unitary pseudogenes in comparison to the mouse genome. (a) The overall methodological flowchart. The number of entries in the input/output data set used at certain steps is shown in parentheses. (b) Detailed inspection and synteny check of the potential human unitary pseudogenic loci. Entries in the initial set of pseudogenic loci are removed based on various criteria at different steps. The final result - the unitary pseudogenes and the polymorphic pseudogenes in human - are listed in Tables 1 and 2. See the main text for details. MGI, Mouse Genome Informatics. OR, olfactory receptor; VR, vomeronasal receptor; ZF, zinc finger protein.