RNA chaperone required for proper U12 intron splicing and for normal growth and development of plants. Mainly responsible for meristem activity. Plays a role in regulating cell division. Component of the U11/U12 snRNPs that are part of the U12-type spliceosome. Ubiquitous. Abundantly expressed in the shoot apical neristem. Embryo lethal when homozygous, and defective for seed maturation when heterozygous.