Fig. 2.

 Second oocyte retrieval from the same unstimulated xenograft. Another lump grew at the graft site during ongoing observation ( a ; lump indicated by an arrow); we aspirated the follicle fluid 37 days after the first oocyte retrieval and examined the aspirate under a stereo-microscope. One oocyte could be harvested, COC already dropped out ( b ; 35 × magnification). Further inspection under an inverted microscope identified one mature metaphase II oocyte ( c ; arrow indicating the first polar body, magnification at 320 ×).