system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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Exhibit 4.1 EXECUTION VERSION REINSURANCE GROUP OF AMERICA, INCORPORATED RGA CAPITAL TRUST I AMENDED AND RESTATED REMARKETING AGREEMENT February 15, 2011 Barclays Capital Inc. 745 Seventh Avenue New York, NY 10019 Ladies and Gentlemen: Reinsurance Group of America, Incorporated, a Missouri corporation (the "Company"), and RGA Capital Trust I, a Delaware statutory business trust (the "Trust"), issued and sold to Lehman Brothers Inc. and Banc of America Securities LLC (the "Underwriters") pursuant to the Underwriting Agreement, dated December 12, 2001 (the "Underwriting Agreement"), 4,500,000 Trust Preferred Income Equity Redeemable Securities ("PIERS")1 units (the "Firm Units") issued pursuant to a Unit Agreement (the "Unit Agreement") dated as of December 18, 2001, as supplemented September 12, 2008, among the Company, the Trust, The Bank of New York Mellon Trust Company, N.A., as successor unit agent (in such capacity, the "Unit Agent"), as successor warrant agent (in such capacity, the "Warrant Agent"), and as successor property trustee (in such capacity, the "Property Trustee"). In addition, the Company and the Trust granted to the Underwriters an option (the "Option") to purchase up to an additional 675,000 Units (the "Option Units" and, together with the Firm Units, the "Units"). Each Unit consists of a preferred security, liquidation preference $50 per security, of the Trust (each, a "Preferred Security") and a warrant (each, a "Warrant") of the Company to purchase at any time prior to the close of business on December 15, 2050, shares (the "Warrant Shares") of common stock, par value $0.01 per share, of the Company ("Common Stock"), subject to antidilution adjustments. Each Preferred Security represents an undivided beneficial ownership interest in the assets of the Trust, which assets consist solely of the 5.75% Junior Subordinated Deferrable Interest Debentures due 2051 of the Company (the "Debentures"). Certain payments on the Preferred Securities and Common Securities (the "Trust Securities") are guaranteed (the "Guarantee") by the Company pursuant to the Guarantee Agreement (the "Guarantee Agreement") dated as of December 18, 2001, between the Company and The Bank of New York Mellon Trust Company, as successor guarantee trustee (in such capacity, the "Guarantee Trustee"). The Trust was formed on February 9, 2001 pursuant to a trust agreement dated as of February 8, 2001 (the "Original Trust Agreement") executed by the Company, as depositor, 1 "Preferred Income Equity Redeemable SecuritiesSM" and "PIERSSM" are service marks owned by Lehman Brothers Inc. and The Bank of New York (Delaware), as Delaware trustee (in such capacity, the "Delaware Trustee"), and a certificate of trust dated as of February 8, 2001 (the "Trust Certificate") filed with the Secretary of State of the State of Delaware. The Trust is governed by, and the Preferred Securities were issued under, the Original Trust Agreement, as amended and restated by the Amended and Restated Trust Agreement (the "Amended and Restated Trust Agreement" and, together with the Original Trust Agreement, the "Trust Agreement")) dated as of December 18, 2001, among the Company, the Property Trustee, the Delaware Trustee and A. Greig Woodring, Jack B. Lay and Todd C. Larson, as the initial administrative trustees (in such capacities, the "Administrative Trustees") which amended and restated the Original Trust Agreement. The Trust used the proceeds from the sale of the Trust Securities to purchase the Debentures that were issued pursuant to the Indenture (the "Original Indenture"), as supplemented by a Supplemental Indenture (the "Supplemental Indenture" and, together with the Original Indenture, as so supplemented, the "Indenture"), in each case, dated as of December 18, 2001 between the Company and The Bank of New York Mellon Trust Company, N.A., as successor indenture trustee (in such capacity, the "Indenture Trustee"). The Trust will, if and to the extent it receives the proceeds of a payment on the Debentures, distribute to the holders of the Preferred Securities all payments so received. The Company issued the Warrants pursuant to a Warrant Agreement (the "Warrant Agreement") dated as December 18, 2001, as amended as of September 12, 2008, between the Company and the Warrant Agent. This Agreement, the Unit Agreement, the Trust Agreement, the Warrant Agreement, the Guarantee Agreement and the Indenture are referred to herein collectively as the "Transaction Agreements" and this Agreement, the Unit Agreement, the Trust Agreement and the Warrant Agreement are referred to herein collectively as the "Unit Documents." The remarketing (the "Remarketing") of the Preferred Securities is provided for in the Trust Agreement and in an agreement dated December 18, 2001 between the Company and Lehman Brothers Inc. (the "Original Remarketing Agreement"), and if the Debentures have been distributed
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Extract the exact clause related to "Source Code Escrow" from the excerpt above.