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Validation and comparison of miRNAs with different expression levels using qRT-PCR. NEC, non-embryogenic callus; EC1, embryogenic callus induced in 4 weeks; EC2, embryogenic callus induced in 6 weeks; GE, globular embryo; TE, torpedo embryo; CE, cotyledon embryo. The qRT-PCR values are the means ± SE of three replicates.
