import/export of info boxes from SBGNML
Free text in SBGN state variables result in removing "value".
For example: state variable that looks like ivis@bilkent
after serialization over minerva is transformed to: @bilkent
reported by newt guys: https://github.com/iVis-at-Bilkent/newt/issues/497
Edited by Piotr Gawron