Ancient genomics of horse domestication.


Pattern formation in the brain Neurons in the developing brain cooperate to build circuits. Mountoufaris et al. found that ~50 variable protocadherin genes support a combinatorial identity code that allows millions of olfactory neuron axons to sort into ~2000 glomeruli. Sharing olfactory receptors drives axons to one glomerulus, and protocadherin diversity allows the multiple axons to touch each other as they converge. On the other hand, Chen et al. found that a single C-type protocadherin underlies the tiled distribution of serotonergic neurons throughout the central nervous system. These neurons, which share protocadherin Edited by Stella Hurtley I N SC IENCE J O U R NA L S RESEARCH


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