Extended Data Fig. 1: CBFs associate with spliceosome-associated proteins.

a, A list of spliceosome-associated proteins identified as CBF2-interacting proteins. b, BiFC assays showing SKIP/CBF2 co-expressed with SR45–mCherry in the nuclei of N. benthamiana leaf cells. nYFP-GUS and cYFP-GUS serve as controls. Scale bars, 10 μm. c, Co-IP assays showing the interactions between SKIP and CBFs in Arabidopsis protoplasts.