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Age-regulated expression of GmExo70J genes in soybean leaves. The first trifoliolate leaves were collected from 2-week-old seedlings at vegetative (V) 1 stage to 11-week-old plants at reproductive (R) 7 stage at 1-week intervals. GmExo70J gene expression was analysed by quantitative qRT-PCR using a soybean actin gene as an internal control.
