Stock Photo - PLANT TISSUE<BR>Meristem of an onion root composed of undifferentiated embryonic cells. Mitosis (cell division) is active in the meristem allowing the root to lengthen. Any cell leaving the meristem looses its capacity for division and differentiates (acquiring different morphological and functional properties) as it lengthens. Here mitosis is less frequent a few millimeters from the end of the root. The cells are becoming longer and contain more and larger vacuoles and plasts X4200

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