WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer and as Trustee and CHRISTIANA BANK & TRUST COMPANY, as Delaware Trustee POOLING AND SERVICING AGREEMENT Washington Mutual Mortgage Securities Corp. Washington Mutual MSC...Pooling and Servicing Agreement • September 12th, 2003 • Washington Mutual Mort Sec Corp Pass THR Cert Se 2003-Ar4 • Asset-backed securities • Delaware
