BiFC of PtrVND6-C1IR with each of the PtrVND6 family members. PtrVND6-C1IR was fused with CFPC, and each of the PtrVND6 family members was fused with CFPN. CFP signal was detected in the nucleus of the SDX protoplasts transfected by H2A:mCherry and PtrVND6-C1IR:CFPC with (A) PtrVND6-A1:CFPN, (C) PtrVND6-A2:CFPN, (E) PtrVND6-B1:CFPN, (G) PtrVND6-B2:CFPN, (I) PtrVND6-C1:CFPN, (K) PtrVND6-C2:CFPN, or (M) PtrVND6-C1IR:CFPN. SDX protoplasts transfected with only (B) PtrVND6-A1:CFPN, (D) PtrVND6-A2:CFPN, (F) PtrVND6-B1:CFPN, (H) PtrVND6-B2:CFPN, (J) PtrVND6-C1:CFPN, (L) PtrVND6-C2:CFPN, or (N) PtrVND6-C1IR:CFPC were used as negative controls. The diameter of the SDX protoplasts is ∼30 μm.