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VC cells at early stage of differentiation ((a) original magnification: 19,600x; scale bar: 2 μm) are present in the CAM at day 13 of incubation, interspersed among the fully differentiated ones (b, original magnification: 11,000x; scale bar: 3 μm). Also elements with the appearance of apoptotic cells are frequently observed (c) original magnification: 33,000x; scale bar: 3 μm). blood sinus (bs); m, mitochondria; n, nucleus. M. G. Gabrielli, unpublished.
