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The OTC recoveries from spiked healthy and Candidatus Liberibacter asiaticus (CLas)-infected trees were 91.4 ± 7.8% and 82.4 ± 3.9%, respectively. We also used the citrate method to determine the level of OTC in trunk-injected trees. The level of OTC as measured using the Eu-OTC-Cit complex (117.5 ± 20.3 µg g-1 fresh weight "FWT" was similar to that measured using Eu-OTC-CTAC complex (97.5 ± 14 µg g-1 FWT). In addition, we were able to visualize the OTC in citrus leaf extract, under ultraviolet light (400 nm), after it was cleaned with t