Trouble with understanding body

[PRATEEK YADAV]

Dear all,

I am running the following code which gives me 376172 results: 

q = """\
    MATCH  (a:Segment{`GNG`:true})
    RETURN a.bodyId
"""
cng = c.fetch_custom(q)
print(f"Found {len(cng)} results")
cng.head()

The user guide says that Segment label is used to query ALL neuron nodes. So, what I don't understand is that how can there be so many neurons. GNG should be having around 483 neurons as per literature. I can't seem to figure out what is wrong with my understanding. This is true for any other brain region as well. There aren't even these many neurons in the entire fly brain. 

Thanking you,

Prateek 

[Greg Jefferis]

Dear Prateek,

Segment returns all objects including tiny fragments in the segmentation that could not be joined up to a neuron even after proofreading. There are a lot of these.

If you change to 

q = """\
    MATCH  (a:Neuron{`GNG`:true})
    RETURN a.bodyId
"""

Then you will get 8089 objects all of which are large and represent a neuron or the largest possible piece thereof.

Best,

Greg.

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[PRATEEK YADAV]

Dear Dr. Jefferis,

Thank you for your response. I am confused. Aren't all objects in the data neurons? Also, GNG has around 480 neurons so I don't understand why there are 8089 neurons being returned. What do you mean by 'tiny fragments of the segmentation...'? Could you please clarify this sir? 

Warm Regards

Prateek