HEI10 and other class I CO proteins mutually promote their condensation. (A) The localization of ZIP4, MSH5, and MLH3 in tobacco nuclei with or without MMS treatment. (B) The colocalization of HEI10 and ZIP4, MSH5, MLH3 in tobacco nuclei with or without MMS treatment. (C) The localization of FANCD2, MUS81, and RMI1 in tobacco nuclei with or without MMS treatment. (D)The colocalization of HEI10 and FANCD2, MUS81, RMI1 in tobacco nuclei with or without MMS treatment. (Scale bar, 5 μm.)