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Nodal signaling plays an essential role during the induction and patterning of vertebrate embryonic tissue types. In Xenopus and zebrafish, microRNAs regulate Nodal signaling, but surprisingly by very different mechanisms.
Animals can benefit from classifying predators or other dangers into categories, tailoring their escape strategies to the type and nature of the risk. Studies of alarm vocalizations have revealed various levels of sophistication in classification (1–5) . In many taxa, reactions to danger are...
The challenges facing the key climate change summit in Bali next month are growing, reports Nigel Williams .
Prey have evolved myriad strategies to escape predation. Ground squirrels tailor their defensive signals to the predator at hand and use infrared warning signals in response to heat-sensitive rattlesnakes.
Vernalization promotes flowering in Arabidopsis through epigenetic repression of the floral repressor, FLOWERING LOCUS C ( FLC ) (1–3) . Vernalization, like other polycomb-mediated repression events (4) , occurs in two stages; FLC repression is established at low temperatures, then maintained...
Mammalian females invest heavily in each of their offspring, but little is known about the magnitude and sources of variation in the most energetically expensive form of maternal investment; milk production (1–5) . Investment strategies may change as females mature because females often begin...
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