When converting [neuron_cd.xml](/uploads/bbf88d54cfb94ee502a89802abed71dc/neuron_cd.xml) to SBGN-ML some species modifications, such as phosphorylation, are retained, but some do not. For example, DRD1 (left border of the compartment) translated well, but HTT (right upper corner) does not. The issue might be, that it is not transferred when it is more complicated modification (in case of HTT "mutated polyQ"). Based on the [sbgn-ml doc](http://libsbgn.sourceforge.net/sbgn.doc/), the state is simple string, so it should be possible to encode arbitrary modifiations.