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Sexual selection theory predicts that sperm competition will push males to produce more, smaller sperm. Paradoxically, in the fruitfly Drosophila bifurca sperm competition is rife but males produce few, giant sperm — the largest known. A recent study reconciles the evolution of giant sperm with...
Most species of the nematode genus Caenorhabditis reproduce through males and females; C. elegans and C. briggsae , however, produce self-fertile hermaphrodites instead of females. These transitions to hermaphroditism evolved convergently through distinct modifications of germline sex...
The small GTPase Ran has been shown to regulate HURP, a protein that interacts with several mitotic spindle assembly factors. This discovery sheds new light on the role of Ran in the fidelity of mitosis and in cancer.
Immunological memory in vertebrates, conferring lasting specific protection after an initial pathogen exposure, has implications for a broad spectrum of evolutionary, epidemiological, and medical phenomena (1) . However, the existence of specificity in protection upon secondary pathogen exposure...
The fringe-lipped bat, Trachops cirrhosus , uses prey-emitted acoustic cues (frog calls) to assess prey palatability (1) . Previous experiments show that wild T. cirrhosus brought into the laboratory are flexible in their ability to reverse the associations they form between prey cues and prey...
The development of the complex network of epithelial tubes that ultimately forms the Drosophila tracheal system relies on cell migration, cell shape changes, cell rearrangements, cell differentiation, and branch fusion (1–3) . Most of these events are controlled by a combination of distinct...
Nonmotile cilia on olfactory sensory neurons (OSNs) compartmentalize signaling molecules, including odorant receptors and cyclic nucleotide-gated (CNG) channels, allowing for efficient, spatially confined responses to sensory stimuli (1–3) . Little is known about the mechanisms of the ciliary...
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