The ORFs of MeSTP genes were amplified using gene-specific primers (Supplementary Table S3) and then cloned into pX-DG vector fused with GFP (green fluorescent protein) according to Chen et al. [55 (link)]. The plasmid constructs were then transiently expressed in cassava mesophyll protoplasts as previously described by Wu et al. [56 (link)]. The GFP fluorescence was imaged using a confocal laser scanning microscope (Leica TCS SPII, Leica Microsystems, Wetzlar, Germany).
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