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Anionic electrophoretic isozyme patterns of peroxidase, esterase and acid phosphatase and cationic peroxidase isozyme patterns from shoot bark protein extracts were used to identify clonal apple scion cultivars. Each of the 21 cultivars included in this study developed a unique combination of isozyme patterns which allowed it to be distinguished from the others. Sports within cultivars exhibited identical patterns of enzymes, with the exception of 'Wijcik', a natural compact mutant ofdoi:10.24266/0738-2898-4.3.101 fatcat:3u43aaw4ezfmfhh25mrqy7p7b4