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Selective remodelling of synapses contributes to the successful wiring of the nervous system during development. Perry and O'Connor discuss recent studies that have implicated a key component of the immune system, the complement cascade, in this process.
Parkinson's disease is characterized by progressive neurodegeneration, but the underlying mechanisms are unclear. Brundin and colleagues discuss how recent reports on the outcome of neuronal grafts carried out in patients with Parkinson's disease might shed light on the disease's progression.
New technologies promise to decipher whole-brain connectivity at a much greater resolution than ever before. Here, Lichtman, Livet and Sanes, the creators of Brainbow, critically assess the applications and challenges of this technology and those of other existing and emerging technologies.
