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a, Image of an F2 surface–Tinaja hybrid female and removed gonad, of indicated weights. b, Histogram displaying per cent gonad weight (gonad weight/total weight, multiplied by 100) of 62 F2 surface–Tinaja hybrid females fed 6 mg per day for 4 months (minimum = 3.57, 1st quartile = 10.64, median = 13.96, mean = 13.96, 3rd quartile = 17.57 and maximum = 41.86)
