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About the Cover
Cover picture Spermatozoa of the red abalone (Haliotis rufescens) navigate towards a conspecific egg (photographed by Jeffrey Riffell) in response to a natural gradient of chemoattractant. The bottom image (photographed by Mia Tegner) shows a male releasing sperm. Like many marine animals, male and female abalone spawn their gametes synchronously into the surrounding sea water, where fertilization depends upon contact between sperm and eggs. The eggs release l-tryptophan, which attracts sperm to the egg surface (top image), as demonstrated by Riffell, Krug and Zimmer (pp. 1439-1450).
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