Exhibit 23.1


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated April 12, 2001
included in Hybridon Inc.'s Form 10-K for the year ended December 31, 2000 and
to all references to our Firm included in this registration statement.


Boston, Massachusetts                          /s/ Arthur Andersen LLP
October 17, 2001.