Exhibit 21
List of Subsidiaries
| Subsidiary* |
Jurisdiction of Incorporation |
Name Under which Subsidiary does Business | ||
| Ingenex, Inc. | Delaware | This subsidiary is currently inactive | ||
| Developmental Therapeutics, Inc. | Delaware | Developmental Therapeutics |
| * | We own 100% of the outstanding common stock of Developmental Therapeutics, Inc. and 81% of the outstanding common stock of Ingenex, Inc. |