typecode = SBML_MODIFIER_SPECIES_REFERENCE
| Version 1 | Version 2 | 
| The ModifierSpeciesReference component is not part of SBML Level 1 Version 1 | The ModifierSpeciesReference component is not part of SBML Level 1 Version 2 | 
| Version 1 | Version 2 | ||||||||||||||||||||||||||||||
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| Version 3 | Version 4 | ||||||||||||||||||||||||||||||||||||
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