MASTR Asset Backed Securities Trust 2005-Opt1 Sample Contracts

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC. Depositor OPTION ONE MORTGAGE CORPORATION Master Servicer and WELLS FARGO BANK, N.A. Trustee

Distribution Instructions • May 27th, 2005 • MASTR Asset Backed Securities Trust 2005-Opt1 • Asset-backed securities • New York

• Contract Type
  Distribution Instructions
• Filed
  May 27th, 2005
• Company
  MASTR Asset Backed Securities Trust 2005-Opt1
• Industry
  Asset-backed securities
• Jurisdiction
  New York

Capitalized words and phrases used herein shall have the respective meanings assigned to them in the Pooling and Servicing Agreement. This Certificate is qualified in all respects by the terms of said Pooling and Servicing Agreement.