BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Ovarian cyst. Light micrograph of a section through a cyst in a follicle of an ovary. Follicular cysts such as this are derived either from incompletely formed Graafian follicles or from follicles that have ruptured but not undergone transition to become a corpus luteum. These cysts are lined internally by granulosa cells (dark, far left).
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