INNERSPACE IMAGING / SCIENCE PHOTO LIBRARY INNERSPACE IMAGING / SCIENCE PHOTO LIBRARY
Maturing follicle. Light micrograph of a sectioned ovary showing a secondary follicle (large purple and white body, upper centre) maturing into an egg. In the secondary follicle stage the chromosome-containing oocyte (purple circle, inside follicle) enlarges and is surrounded by many granulosa cells (dark purple dots). A large fluid-filled space (the antrum, white marbled with blue) also develops. One secondary follicle per month becomes a Graafian follicle, releasing its egg at ovulation. Trichrome stain. Magnification: x46 at 6x7cm size x23 at 35mm size.
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