Although clear concordance with transcriptomic profiles is evident at the level of major projection type, fine-grained morphological diversity often does not readily correlate with transcriptomic subtypes derived from unsupervised clustering, highlighting the need for single-cell cross-modality studies. This diversity follows a set of generalizable principles that govern long-range axonal projections at different levels, including molecular correspondence, divergent or convergent projection, axon termination pattern, regional specificity, topography, and individual cell variability. Extensive projectional diversity was found within each of these major types, on the basis of which some types were clustered into more refined subtypes. We identified 11 major projection neuron types with distinct morphological features and corresponding transcriptomic identities. We fully reconstructed 1,741 neurons from cortex, claustrum, thalamus, striatum and other brain regions in mice. Here, to systematically examine complete single-neuron morphologies on a brain-wide scale, we established a pipeline encompassing sparse labelling, whole-brain imaging, reconstruction, registration and analysis. Nature volume 598, pages 174–181 ( 2021) Cite this articleĭendritic and axonal morphology reflects the input and output of neurons and is a defining feature of neuronal types 1, 2, yet our knowledge of its diversity remains limited. Morphological diversity of single neurons in molecularly defined cell types
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