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Neuropilin 2 (Nrp2) is expressed by a subset of mitral cells in the postero-ventral olfactory bulb in mice. Here the authors show that Nrp2 is sufficient to instruct mitral cell targeting to the anterior part of medial amygdala that modulates olfactory-driven attractive social behaviour.
The olfactory bulb is arranged in glomeruli defined by their olfactory receptor expression. The authors identify an olfactory receptor for fox odour, TMT, and show that activation of the glomerulus expressing that receptor in mice leads to immobility, but does not lead to other fear behaviours.
In mice, the endocannabinoid system inhibits glutamatergic signalling from the olfactory cortex to the main olfactory bulb after fasting, increasing the detection of food odours and, consequently, enhancing food consumption.
Learned odor discrimination and generalization are reflected in patterns of ensemble activity in anterior piriform cortex, where learned discrimination between two odors reduces the correlation between their induced patterns.