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Acknowledgement
The author thanks Prof. Matsuishi Takashi Fritz and Prof. Kashiwagi Junichi for providing
precious comments for finalizing the thesis. Prof. Takahashi Masashi provided a fluorescence
microscope and microtome. The Stranding Network Hokkaido and the Matsuishi laboratory
members provided the cetacean samples. Prof. Nakaoka Masahiro assisted with the sample
collections. Prof. Helena Fortunato revised the research paper. Prof. Kawaguchi Toshikazu and his
lab numbers provided technical advice for the analysis. Mr Shikichi Masato of the Hokkaido Local
Government kindly supported contacting the Fisheries Cooperative Associations. The thesis has
not been completed without their assistance. This work was supported by JST SPRING, Grant
Number JPMJSP2119.
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