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Boylan, Jennifer Finney. 2003. She's Not There: A Life in Two Genders. New York: Broadway Books. Jennifer Boylan, an English professor in Maine, was once Jim. She is transgendered.

Colapinto, J. 2000. As Nature Made Him. New York: HarperCollins. The true story of David Reimer, whose sex reassignment surgery was a tragic failure.

Gunter, Chris. March 17, 2005. She moves in mysterious ways. Nature 434:279. "As the rock band U2 would say, the X moves in mysterious ways, and we've just been given a preview," concludes this look at the human X chromosome.

Hunt, David M., et al. February 17, 1995. The chemistry of John Dalton's colorblindness. Science, vol. 267. The famous chemist requested that his eyeballs be examined after his death to localize the cause of his colorblindness.

Lewis, Ricki. July 28, 2003. Y envy. The Scientist 17(15):64. The author laments lacking a Y.

Lewis, Ricki. October 28, 2002. Solid Gold sheepstakes. The Scientist 16(21):16. A sheep with a huge rear end illustrates genomic imprinting.

Lewis, Ricki. July 10, 2000. Reevaluating sex reassignment. The Scientist 14:14. Research supports anecdotal evidence that sex reassignment is often unsuccessful.

Pennisi, Elizabeth. March 18, 2005. Mutterings from the silenced X chromosome. Science 307:1708. The X chromosome is not quite as silenced in females as was thought.

Skaletsky, Helen, et al. June 19, 2003. The male-specific region of the human Y chromosome is a mosaic of discrete sequence classes. Nature 423:825–37. The DNA sequence of the Y chromosome is revealed.

Tilford, Charles A. February 15, 2001. A physical map of the human Y chromosome. Nature 409:943–45. The Y chromosome carries very few protein-encoding genes.

Zimmer, Carl. September 2002. The once and future male: Men will survive even after the pivotal genes that make them men disappear. Natural History 111(9):22–26. The Y chromosome may be on the way out, but the human male is here to stay.