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Descriptive summary of avian follicles. F1, F2, F3, F4, F5, F6, F7, and F8 represent the first, second, third, fourth, fifth, sixth, seventh, and eighth large yellow follicles, respectively. Small yellow follicle (SYF) and large white follicle (LWF) represent small yellow follicles with diameter 6–8 mm and large white follicles with diameter < 6 mm, respectively.
