Bradbury, Jane. May 19, 2001. Teasing out the genetics of bipolar disorder. The Lancet 257:1596. Many genes lead to the mood swings of bipolar disorder.

Cavendish, Harry. December 2001. Saved by Ezmerelda. The Lancet, suppl., 560. This journalist describes what it's like to live with schizophrenia.

Clayton, J. D., et al. February 15, 2001. Keeping time with the human genome. Nature 409:829–31. Several genes control the sleep-wake cycle.

Lesch, Peter K. December 2001. Weird world inside the brain. The Lancet, suppl., 559. Schizophrenia is actually several disorders.

Lewis, Ricki. June 25, 2001. Focusing on endocannabinoid. The Scientist 15(13):14. Marijuana exerts its effects because our brain cells have receptors for it.

Maher, Brendan. November 3, 2003. The infection connection in schizophrenia: A combination of environmental events and genetic susceptibility underlie schizonphrenia. The Scientist 17 21, 30-31.

McGuffin, Peter, et al. February 16, 2001. Toward behavioral genomics. Nature 291:1232–33. Part of the human genome project is to identify genes that affect behavior.

Nestler, Eric J. November 2000. Genes and addiction. Nature Genetics 26:277–80. Drug-seeking behavior reflects aberrant brain function, which reflects the actions of certain gene variants.

Peyron, C., et al. September 2000. A mutation in a case of early-onset narcolepsy and a generalized absence of hypocretin peptide in human narcoleptic brains. Nature Medicine 6(9):991–97. A single-gene mutation can cause narcolepsy.

Robinson, Gene. December 13, 2004. The behavior of genes. The New York Times, p. F1. Athletic ability is not a simple inherited trait.

Stefansson, H., et al. October 2002. Neuregulin 1 and susceptibility to schizophrenia. The American Journal of Human Genetics 71:877–92. The Icelandic population database reveals a gene that can cause schizophrenia.