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. 2021 May 25;10:e66018. doi: 10.7554/eLife.66018

Table 3. Description of neuron metadata listed in supplementary files.

Column name Description
bodyid A unique identifier for a single hemibrain neuron
pre The number of presynapses (outputs) a neuron contains, each of these is polyadic
post The number of postsynapses (inputs) to the neuron
upstream The number of incoming connections to a neuron
downstream The number of outgoing connections from a neuron
voxels Neuron size in voxels
soma Whether the neuron has a soma in the hemibrain volume
name The name of this neuron, as read from neuPrint
side Which brain hemisphere contains the neuron’s soma
connectivity.type A subset of neurons within a cell type that share similar connectivity, a connectivity type is distinguished from a cell type by an ending _letter unless there is only one connectivity type for the cell type, defined using CBLAST (Scheffer et al., 2020)
cell.type Neurons of a shared morphology that take the same cell body fibre tract and come from the same hemilineage (Bates et al., 2019)
class The greater anatomical group to which a neuron belongs, see Figure 1
cellBodyFiber The cell body fibre for a neuron, as read from neuPrint (Scheffer et al., 2020)
ItoLee_Hemilineage The hemilineage that we reckon this cell type belongs to, based on expert review of light-level data from the K. Ito and T. Lee groups (Yu et al., 2013; Ito et al., 2013)
Hartenstein_Hemilineage The hemilineage that we reckon this cell type belongs to, based on expert review of light-level data from the V. Hartenstein group (Wong et al., 2013; Lovick et al., 2013)
putative.classic.transmitter Putative neurotransmitter based on what neurons in the hemilineage in question have been shown to express, out of acetylcholine, GABA and/or glutamate
putative.other.transmitter Potential second neurotransmitter
FAFB.match The ID of the manual match from the FAFB data set, ID indicates a neuron reconstructed in FAFBv14 CATMAID, many of these neurons will be available through Virtual Fly Brain, https://v2.virtualflybrain.org/
FAFB.match.quality The matcher makers’ qualitative assessment of how good this match is: a poor match could be a neuron from a very similar cell type or a highly untraced neuron that may be the correct cell type; an okay match should be a neuron that looks to be from the same morphological cell type but there may be some discrepancies in its arbour; a good match is a neuron that corresponds well between FAFB and the hemibrain data
layer Probabilistic mean path length to neuron from ALRNs, depends on connection strengths
layer.ct The mean layer for cell type, rounded to the nearest whole number
axon.outputs Number of outgoing connections from the neuron’s predicted axon
dend.outputs Number of outgoing connections from the neuron’s predicted dendrite
axon.inputs Number of incoming connections from the neuron’s predicted axon
dend.inputs Number of incoming connections from the neuron’s predicted dendrite
total.length Total cable length of the neuron in micrometres
axon.length Total axon cable length of the neuron in micrometres
dend.length Total dendrite cable length of the neuron in micrometres
pd.length Total cable length of the primary dendrite ’linker’ between axon and dendrite
segregation_index A quantification of how polarised a neuron is, in terms of its segregation of inputs onto its predicted dendrite and outputs onto its axon, where 0 is no-polarisation and 1 is totally polarised (Schneider-Mizell et al., 2016)
notes Other notes from annotators