. 2018 Dec 20;9:1846. doi: 10.3389/fphys.2018.01846
Copyright © 2018 Eusemann, Sharifi, Patt, Reinhard, Schrader, Thöne-Reineke and Petow.
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FIGURE 2.
Sonogram of the ovary of a hen. The arrow marks an ovarian follicle.