To change the type of a species:
1. Double click the target species.
or click with the right mouse button on the target in the draw area, then select [Edit Protein].
Then the "Change identity of the species" dialog would display.
2. Specify the "class" in the dialog.
- PROTEIN
- GENE
- RNA
- ANTISENSE_RNA
- PHENOTYPE
- ION
- SIMPLE_MOLECULE
- DRUG
- UNKNOWN
- DEGRADED

