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Small silencing RNAs repress gene expression by a set of related mechanisms collectively called RNA-silencing pathways (1, 2) . In the RNA interference (RNAi) pathway (3) , small interfering mRNA (siRNAs) defend cells from invasion by foreign nucleic acids, such as those produced by viruses. In...
A new project aims to build public support for moths and develop the world's largest database of the distribution and abundance in the face of alarming decline in many species. Nigel Williams reports.
Many bacteria simultaneously grow and spread rapidly over a surface that supplies them with nutrient. Called ‘swarming’, this pattern of movement directs new cells to the edge of the colony. Swarming reduces competition between cells for nutrients, speeding growth. Behind the swarm edge,...
Nongenetic transmission of behavioral traits via social learning allows local traditions in humans, and, controversially, in other animals (1–4) . Social learning is usually studied as an intraspecific phenomenon (but see (5–7) ). However, other species with some overlap in ecology can be...
Background Several checkpoint pathways employ Wee1-mediated inhibitory tyrosine phosphorylation of cyclin-dependent kinases (CDKs) to restrain cell-cycle progression. Whereas in vertebrates this strategy can delay both DNA replication and mitosis, in yeast cells only mitosis is delayed. This is...
A recent book charts the history of metabolic scaling laws. Is this a place to look for a grand unified theory in biology? Florian Maderspacher reports.
Background Accurate chromosome segregation depends on the establishment of correct—amphitelic—kinetochore orientation. Merotelic kinetochore orientation is an error that occurs when a single kinetochore attaches to microtubules emanating from opposite spindle poles, a condition that hinders...
In rare cases, damage to the temporal lobe causes a selective impairment in the ability to learn new faces, a condition known as prosopamnesia (1) . Here we present the case of an individual with prosopamnesia in the absence of any acquired structural lesion. “C” shows intact processing of...
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