----

----

 

| Delaware                                                            | 33-0995817                                |
|---------------------------------------------------------------------|-------------------------------------------|
| (State      or other jurisdiction of incorporation or organization) | (I.R.S.      Employer Identification No.) |
|                                                                |                                      |
| 5001      Spring Valley Rd, Suite 1040 - West, Dallas, Texas75244   |
| (Address      of principal executive offices and Zip Code)          |
|                                                                |                                      |
| (972)      455-8950                                                 |
| (Registrant's      telephone number, including areacode)            |

|  Large      accelerated filer    ̈       |                                                      | Accelerated      Filer    ̈    |
|-------------------------------------------------------------------------------------------|-----------------------------------------------------------|-------------------------------------------------------------|
|                                                                                      |                                                      |                                                        |
|  Non-accelerated      filer  ̈                                              | (Do not      check if a smaller reporting company.)  | Smaller reporting      company   x                |

----

----

----

----

| Exhibit No. | Description                                                                                                                                                                                     |
|-------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 31.1*       | Certification      of Principal Executive Officer required under Rule 13a-14(a) or Rule      15d-14(a) of the Securities and Exchange Act of 1934, as      amended.                             |
| 31.2*       | Certification      of Principal Financial Officer required under Rule 13a-14(a) or Rule      15d-14(a) of the Securities and Exchange Act of 1934, as      amended.                             |
| 32.1**      | Certification      of Principal Executive Officer required under Rule 13a-14(b) or Rule      15d-14(b) of the Securities and Exchange Act of 1934, as amended, and 18      U.S.C. Section 1350. |
| 32.2**      | Certification      of Principal Financial Officer required under Rule 13a-14(b) or Rule      15d-14(b) of the Securities and Exchange Act of 1934, as amended, and 18      U.S.C. Section 1350. |
| *           | Filed      herewith                                                                                                                                                                             |
| **          | Previously      Filed                                                                                                                                                                           |

----

| Date:      August 13, 2008  | By:    | /s/      ARTHUR P. BOLLON, PH.D.                                                                |
|-----------------------------|--------|-------------------------------------------------------------------------------------------------|
|                        |   | Arthur      P. Bollon, Ph.D.                                                                    |
|                        |   | Chairman      of the Board of Directors, President and Chief Executive      Officer   |
| Dated:      August 13, 2008 | By:    | /s/      MARK J. ROSENBLUM                                                                      |
|                        |   | Mark      J. Rosenblum                                                                          |
|                        |   | Chief      Financial Officer and Secretary                                                      |

----