| References | Ref.366 : Tsushima, Miyuki; Maoka, Takashi; Matsuno, Takao, Comparative Biochemistry and Physiology, Part B:  Biochemistry & Molecular Biology (1989), 93B(3), 665-71., "Comparative biochemical studies of carotenoids in marine invertebrates - the first positive identification of ε,ε-carotene derivatives and isolation of two new carotenoids from chitons" 
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