histone pre-mRNA 3'end processing complex mah GO:0071204 histone 3'end pre-mRNA complex A ribonucleoprotein that binds to specific sites in, and is required for cleavage of, the 3'-end of histone pre-mRNAs. The complex contains the U7 snRNP and additional proteins, including the stem-loop binding protein (SLBP) and the exonuclease 3'hExo/Eri-1. 2009-11-25T11:11:02Z cellular_component nuclear protein-containing complex ribonucleoprotein complex