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Young v-cells are in green and mature one in blue. The young v-cell behaviour of death occurs when the cell is too old or when its surface contact with water is not enough. Young v-cells can differentiate into mature v-cells when the contact with water is sufficient and if they are still in contact with other mature v-cells. The mature v-cell behaviour of division is activated when the cell is still supplied by the nutriments in water and if it is young enough but not too old.