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Growth curves of fresh and cryopreserved cell lines: a M4 cell line, b M6 cell line, c M7 cell line and d the same growth curves for the three cell lines combined in order to show the similarity in the growth pattern. Data is presented as the average of duplicates from three different experiments. Bars represent + SD. *Significant statistical difference between fresh and cryopreserved at p ≤ 0.05
