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Laccase (EC 1.10.3.1) activity was measured in regenerating and non-regenerating protoplasts isolated from tobacco (Nicotiana tabacum, L.) leaves. Laccase activity diminished soon after isolation; there-after, it steadily increased in regenerating protoplasts during a 6-day culture period, whereas it was undetectable in non-regenerating protoplasts. A different pattern of isoforms was expressed in...
In winged bean (Psophocarpus tetragonolobus) protein kinases (E.C. 2.7.1.37) were found in all tissues studied. There was a significant increase in kinase activity during seed development, with a concomitant enhancement in the phosphorylation of a number of polypeptides; this was reversed in germinating seed cotyledons. Protein phosphorylation was apparently correlated with the increase in the protein...
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