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:
"""
Parties may exchange information regarding their respective INTELLECTUAL PROPERTY at other times as they deem fit. 4.12 The provisions of this Article 4 and specifically but without limitation the definitions in Articles 4.1 through 4.4 and Articles 4.6 and 4.7 shall apply to any results obtained in RESEARCH PROJECTS, including results of activities covered by EXISTING AGREEMENTS, except if expressly provided otherwise in a SCHEDULE or in Article 18. 5.1.1 Through the express grant of such rights in any SCHEDULE, CERES may grant IGER the right to use CERES INTELLECTUAL PROPERTY to the extent required for, and for the sole purpose of, the performance by IGER (or its SUBCONTRACTORS) of RESEARCH PROJECTS. SCHEDULES may specify that similar rights are granted with respect to defined elements of CERES BACKGROUND INTELLECTUAL PROPERTY. 5.1.2 IGER shall have the right to use JOINT INTELLECTUAL PROPERTY and OTHER RESEARCH RESULTS (a) for the purpose of the implementation of RESEARCH PROJECTS; (b) subject to Article 3 and CERES' prior written approval, for internal research purposes and research under United Kingdom government or European Union funding in collaboration with academic institutions in the European Union, provided that CERES' approval may be conditional upon (i) CERES receiving the exclusive right (subject to Articles 5.1.2(a) and 5.2) to use and exploit commercially the results of such research in COLLABORATION CROPS, (ii) adequate safeguards to prevent unauthorized use or disclosure of JOINT INTELLECTUAL PROPERTY, OTHER RESEARCH RESULTS or results directly or indirectly based on any of the foregoing and (iii) CERES reviewing and approving the terms and conditions of any agreement governing such research activities. 5.2.1 "RELEASED VARIETY" shall mean any variety of a COLLABORATION CROP which constitutes JOINT INTELLECTUAL PROPERTY and which is released for commercialization pursuant to a SCHEDULE. IGER shall have the non-exclusive right to exploit commercially RELEASED VARIETIES in the United Kingdom. 5. USE AND COMMERCIALIZATION RIGHTS. 5.1 IGER Research Rights. 5.2 Commercialization Rights of IGER in the United Kingdom. CERES-IGER Collaboration Agreement Page 14 of 75 5.2.2 If the commercial exploitation of a RELEASED VARIETY in the United Kingdom by IGER requires a license on CERES INTELLECTUAL PROPERTY or BACKGROUND INTELLECTUAL PROPERTY of CERES, CERES shall negotiate in good faith with IGER or a designee of IGER about the grant of such a license, provided however that CERES shall have no obligation to grant any license on transgenes or transgenic technologies. 5.2.3 Unless otherwise agreed by the Parties, IGER shall pay royalties to CERES under its non-exclusive right set forth in Article 5.2.1 at a rate equal to one half of the royalty rate in CERES' exclusive license agreement for the same RELEASED VARIETY, and CERES shall pay royalties at the same rate to IGER for sales by CERES, its AFFILIATED COMPANIES or licensees in the United Kingdom. 5.3.1 Subject to Articles 5.1 and 5.2, the Parties acknowledge and agree that CERES shall have the exclusive right, with the right to grant sublicenses to this right, to use and commercially exploit JOINT INTELLECTUAL PROPERTY (including but not limited to RELEASED VARIETIES) and OTHER RESEARCH RESULTS for any and all uses and fields, including, but not limited to, use in the COLLABORATION CROPS and crops other than the COLLABORATION CROPS. Any commercialization (including, but not limited to, the grant of commercialization licenses) of JOINT INTELLECTUAL PROPERTY and/or OTHER RESEARCH RESULTS shall result in CERES paying IGER a reasonable remuneration (whether as a royalty or in some other form as the Parties may agree) to be negotiated in good faith. The terms for remuneration will be specified, with respect to specific RESEARCH PROJECTS, JOINT INTELLECTUAL PROPERTY and/or OTHER RESEARCH RESULTS, either in the respective SCHEDULES or in other agreements to be executed by the Parties. 5.3.2 Subject to Articles 5.1 and 5.2, IGER grants CERES an exclusive, world-wide license, with the right to grant sublicenses, to use and exploit commercially (a) IGER's interest in any JOINT INTELLECTUAL PROPERTY (including but not limited to RELEASED VARIETIES) and OTHER RESEARCH RESULTS; (b) IGER INTELLECTUAL PROPERTY and (c) when and only to the extent necessary for the commercialization or use of JOINT INTELLECTUAL PROPERTY and/or OTHER RESEARCH RESULTS and/or IGER INTELLECTUAL PROPERTY for the COLLABORATION CROPS, IGER BACKGROUND INTELLECTUAL PROPERTY, subject to paying IGER reasonable remuneration (whether as a royalty or in some other form as the Parties may agree) to be negotiated in good faith. Such license grants will be further specified in SCHEDULES to this Agreement and/or other agreements to be executed by the Parties. Unless otherwise agreed
"""

Extract the exact clause related to "Exclusivity" from the excerpt above.

assistant: Subject to Articles 5.1 and 5.2, IGER grants CERES an exclusive, world-wide license, with the right to grant sublicenses, to use and exploit commercially (a) IGER's interest in any JOINT INTELLECTUAL PROPERTY (including but not limited to RELEASED VARIETIES) and OTHER RESEARCH RESULTS; (b) IGER INTELLECTUAL PROPERTY and (c) when and only to the extent necessary for the commercialization or use of JOINT INTELLECTUAL PROPERTY and/or OTHER RESEARCH RESULTS and/or IGER INTELLECTUAL PROPERTY for the COLLABORATION CROPS, IGER BACKGROUND INTELLECTUAL PROPERTY, subject to paying IGER reasonable remuneration (whether as a royalty or in some other form as the Parties may agree) to be negotiated in good faith.