old_contents: from .citation import cite_me_please
  from .fluxes import measure_fluxes
  from .gapfill_from_roles import gapfill_from_roles
  from .assigned_functions_to_reactions import to_reactions
  from .fba_from_reactions import run_the_fba
  from .gapfill_from_reactions_multiple_conditions import gapfill_multiple_media
  from .media import list_media
  
  # Don't forget to add the imports here so that you can import *
  
  __all__ = [
      'cite_me_please', 'measure_fluxes', 'gapfill_from_roles', 'to_reactions', 'run_the_fba', 'gapfill_multiple_media',
      'list_media'
  ]
  
new_contents: from .citation import cite_me_please
  from .fluxes import measure_fluxes
  from .gapfill_from_roles import gapfill_from_roles
  from .assigned_functions_to_reactions import to_reactions
  from .fba_from_reactions import run_the_fba
  from .gapfill_from_reactions_multiple_conditions import gapfill_multiple_media
  from .media import list_media
  from .reactions_to_roles import convert_reactions_to_roles
  
  # Don't forget to add the imports here so that you can import *
  
  __all__ = [
      'cite_me_please', 'measure_fluxes', 'gapfill_from_roles', 'to_reactions', 'run_the_fba', 'gapfill_multiple_media',
      'list_media', 'convert_reactions_to_roles'
  ]
  
subject: Add a function to retrieve roles from reactions