Sunlight influences mood and serotonin turnover in the normal human brain.

can invade erythrocytes via a glycophorin C-mediated pathway.

Persistent immune activation can result in lethal immunodeficiency.

A guanylate cyclase inhibitor induces cellular senescence without inducing DNA damage.

latency and immunity.

A decrease in IGF-1 receptor levels can increase lifespan in a mammalian species.

Treatment with Il-4 induces Th2 responses and improves human psoriasis.

Botulinum neurotoxin light chain protease enters cells through its heavy chain.

Hybrids that maintain the parental chromosome number (homoploid hybrid speciation) and are fertile, are uncommon in plants and unknown in animals. In November 29 Science, Duncan Greig and colleagues at The Galton Laboratory, University College London, UK, show that homoploid hybrid speciation can easily occur between two experimental populations of yeast and the resulting hybrids are fertile (Science, 298:1773-1775, November 29, 2002).Greig et al. used the ability of Saccharomyces gametes to div

use hydrogen from colonic fermentation as an energy source.

Neuron-to-astrocyte signaling has a key role in the control of brain microcirculation.

Horizontal gene flow played a key role in the evolution of bacterial photosynthesis.