I just got this picture so I'm trying to figure out what the blue stuff is myself! I'm using this new technique called trans-tango. So the golden strands are neurons that we know the identity of (I don't want to get to specific here to not dox myself... small field), and the blue are the neurons that the gold neurons connect to.

I think we labelled too many with the gold, so it's a little challenging to see what's going on... But it's pretty nonetheless!