In general I would only use broad synonym if there is no term to attach the same name to as an exact synonym to (or maybe in this case 'related' + abbreviation - following general policy on abbreviations). Important to think from the perspective of someone searching the ontology.
(Apologies for missing this on PR. Easier to read if you run gogoedit diff when you want a review.)
Shouldn't 'DaN' be an exact synonym on Dopaminergic neuron?
substantia nigra dopaminergic neuron has_broad_synonym "DaN"
In general I would only use broad synonym if there is no term to attach the same name to as an exact synonym to (or maybe in this case 'related' + abbreviation - following general policy on abbreviations). Important to think from the perspective of someone searching the ontology.
(Apologies for missing this on PR. Easier to read if you run gogoedit diff when you want a review.)