EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


    As independent public accountants, we hereby consent to the incorporation of
our reports included in this Annual Report on Form 10-K/A, into the Company's
previously filed Registration Statements on Form S-8 (File Nos. 033-75934,
333-04280, 333-08047, 333-75339 and 333-43802) and Form S-3 (File Nos.
333-05939, 333-37921, 333-87157 and 333-94859).


                                          /s/ Arthur Andersen LLP


Boston, Massachusetts
March 5, 2001