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The YFP signal in 5-week-old Nicotiana tabacum cells transiently transformed with BiFC constructs shows interaction between AtSPS and AtSPP proteins. (A) EM–EM negative control, (B) 35SP –YFP positive control, (C) SPS–EM negative control, (D) EM–SPP1 negative control, (E) SPS–SPP1, (F), SPS–SPP2, (G) SPS–SPP3, and (H) SPS–SPP4. Scale bar=20 μm.
