Joint Filing Agreement The undersigned hereby consent to the joint filing by any of them of a Statement on Schedule 13D and any amendments thereto, whether heretofore or hereafter filed, relating to the common stock, par value $.001 per share, of...

                                                                    EXHIBIT I






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                            Joint Filing Agreement
                                       
                  The undersigned hereby consent to the joint filing by any of
them of a Statement on Schedule 13D and any amendments thereto, whether
heretofore or hereafter filed, relating to the common stock, par value $.001 per
share, of GeneMedicine, Inc.



Dated:            February 20, 1997

                                                      

                                  /s/ XXXXXXXX X. XXXXXXX
                                  ---------------------------------------------
                                  Xxxxxxxx X. Xxxxxxx


                                  THE FREEDOM CHARITABLE REMAINDER TRUST

                                  By: /s/ XXXXXXXX X. XXXXXXX
                                      -----------------------------------------
                                      Xxxxxxxx X. Xxxxxxx, Trustee


                                  THE FRONTIER CHARITABLE REMAINDER TRUST

                                  By: /s/ XXXXXXXX X. XXXXXXX
                                      -----------------------------------------
                                      Xxxxxxxx X. Xxxxxxx, Trustee


                                  THE SENTINEL CHARITABLE REMAINDER TRUST

                                  By: /s/ XXXXXXXX X. XXXXXXX
                                      -----------------------------------------
                                      Xxxxxxxx X. Xxxxxxx, Trustee


                                  THE BLECH FAMILY TRUST

                                  By: /s/ XXXXXXXX X. XXXXXXX
                                      -----------------------------------------
                                      Xxxxxxxx X. Xxxxxxx, Trustee
                                      

 
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