Enables histone pre-mRNA DCP binding activity. Predicted to be involved in mRNA 3'-end processing by stem-loop binding activity and cleavage and positive regulation of G1/S transition of mitotic cell cycle. Predicted to act upstream of or within RNA splicing and mRNA processing. Predicted to be located in Cajal body. Predicted to be part of U7 snRNP and cytoplasmic U snRNP body. Predicted to be active in nuclear body. Orthologous to human LSM10 (LSM10, U7 small nuclear RNA associated). [provided by Alliance of Genome Resources, Apr 2022]