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Effect of different concentration of polyethylene glycol (PEG-6000) on the growth and appearance of the in vitro culture of apple cultivar “Rubinstep” (A) and cherry cultivar “Kaštánka” (B); PEG concentration in g L−1 increasing from left to right (PEG0, PEG5, PEG10, PEG25, PEG50).
