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Bucharest, Romania
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Rose Selamort studies the spontaneous sexual metamorphosis in a fish family called wrasses:
"Males of labroides dimidiatus control the process of sex reversal within social groups. Each group consists of a male with a harem of females, among which larger individuals dominate smaller ones. The male in each harem suppresses the tendency of the females to change sex, by actively dominating them. Death of the male releases this suppression and the dominant female of the harem changes sex immediately."