Common use of Book Entry Clause in Contracts

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture to the Company unless (A) the full Conversion Amount represented by this Debenture is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture upon physical surrender of this Debenture. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture upon conversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount Principal amount and all accrued and unpaid Interest represented by this Debenture Note is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount represented by this Debenture Note is being converted at the option of the Holder or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture to the Company unless (A) the full Conversion Amount represented by this Debenture is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture upon physical surrender of this Debenture. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture upon conversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount represented by this Debenture Note is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a the Conversion Notice or Antigenics MA Stock Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.

Book Entry. Notwithstanding anything to the contrary set contraryset forth herein, upon conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount Principal amount and all accrued and unpaid Interest represented by this Debenture Note is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount Principal amount and all accrued and unpaid interest represented by this Debenture Note is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in In a Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions (or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.

Book Entry. Notwithstanding anything to the contrary ---------- set forth herein, upon conversion Conversion of any portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture Note to the Company unless (A) the full Conversion Amount represented by this Debenture Note is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal Principal, Interest and Interest Late Charges converted and the dates of such conversions Conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversionConversion.

Book Entry. Notwithstanding anything to the contrary set forth herein, herein upon conversion of any an portion of this Debenture Note in accordance with the terms hereof, the Holder shall not be required to physically t phs1cally surrender this Debenture Note to the Company unless (A) the full Conversion Amount represented by this Debenture Note is being converted or (B) BJ the Holder has provided the Company with prior written notice (which notice may be included in m a Conversion Notice) requesting reissuance re1ssuance of this Debenture Note upon physical surrender of this DebentureNote. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or .or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture Note upon conversion.