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Background When chromatin diminution occurs during a cell division a portion of the chromatin is eliminated, resulting in daughter cells with a smaller amount of genetic material. In the parasitic roundworms Ascaris and Parascaris , chromatin diminution creates a genetic difference between the...
How are the lateral root founder cells specified in the pericycle to initiate lateral root development? An Aux/IAA28 signaling module activates transcription factor GATA23 to control founder cell identity.
Many systems regulating cell polarity involve stable landmarks defined by internal cues ( 1–5 ). In the rod-shaped fission yeast Schizosaccharomyces pombe , microtubules regulate polarized vegetative growth via a landmark involving the protein Tea1 ( 6–9 ). Tea1 is delivered to cell tips as...
Recently, a non-coding RNA expressed from a human pseudogene was reported to regulate the corresponding protein-coding mRNA by acting as a decoy for microRNAs (miRNAs) that bind to common sites in the 3′ untranslated regions (UTRs). It was proposed that competing for miRNAs might be a general...
Current theoretical positions assume that action-related word meanings are established by functional connections between perisylvian language areas and the motor cortex (MC) ( 1–4 ) according to Hebb's associative learning principle ( 5 ). To test this assumption, we probed the functional...
Polymorphisms in reproductive strategies are among the most extreme and complex in nature. A prominent example is male body size and the correlated reproductive strategies in some species of platyfish and swordtails of the genus Xiphophorus . This polymorphism is controlled by a single Mendelian...
Within African savannas, elephants often damage individual trees to the extent that they influence tree density. New research shows that mutualistic ants inhabiting certain species of Acacia protect trees from catastrophic herbivory by elephants. Protection by the ants stabilizes tree cover...
A recent paper shows that dull-plumaged male house finches can improve their mating success by moving to a different social network, where their plumage is brighter relative to that of other males.
A new study on rainforest carbon emissions is one new tool in climate change research. Nigel Williams reports.
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