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# Concepts / # partial-areas for areas with one relationship (2004 vs. 2007)
| Area Name | 2004 Version | 2007 Version | ||||
|---|---|---|---|---|---|---|
| C | PA | C/PA | C | PA | C/PA | |
| substance | 56 | 15 | 3.7 | 81 | 10 | 8.1 |
| morphology | 15 | 9 | 1.7 | 14 | 1 | 14.0 |
| topography | 297 | 112 | 2.7 | 333 | 25 | 13.3 |
| procedure | 12 | 9 | 1.3 | 20 | 7 | 2.9 |
| identity | 19 | 8 | 2.4 | 20 | 2 | 10.0 |
