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Nest-like clusters of uniform, round-to-polygonal chief cells surrounded by delicate richly vascular tissue and sustentacular cells, a pattern characteristic of paraganglioma
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When they were placed in a soft gel with the consistency of bone marrow jelly, the cell balls remained unchanged for long periods of time and displayed no unwanted differentiations.
These cell balls, which contain a thousand or more "plantlets," are then transferred to another medium to promote root growth.