| 21. | The olfactory receptor gene family is the largest in the genome.
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| 22. | Ectopic gene conversion is the driving force for concerted evolution of gene families.
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| 23. | Perilipin is part of a gene family with five currently-known members.
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| 24. | This gene encodes a member of the membrane-spanning 4A gene family.
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| 25. | This gene is a member of the cytidine deaminase gene family.
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| 26. | These include the " ras " homolog gene family member H.
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| 27. | New gene families originate from orphan genes ( isolated pseudogenes ).
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| 28. | This gene belongs to the tissue inhibitor of metalloproteinases gene family.
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| 29. | Current research holds that the homeobox gene family is important in appendage development.
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| 30. | Contraction deletes divergent gene copies and keeps gene families from becoming too large.
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