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Cortisol-induced masculinization of adult female mosquitofish. Anal fins of (a) normal female, (b) cortisol-exposed female and (c) normal male. (d) Anal fin of a cortisol-treated female illustrating ray length measurements (black lines) used to calculate the masculinization index (see text). (e) Distal tip structures on the anal fin of a cortisol-treated female (alizarin stain). Scale bars, (a–c) 1 mm.
