spliceosomal complex obsolete heterogeneous nuclear ribonucleoprotein complex true hnRNP Wikipedia:Heterogeneous_ribonucleoprotein_particle heterogeneous nuclear ribonucleoprotein complex cellular_component heterogeneous nuclear ribonucleoprotein GO:0030530 This term was made because heterogeneous nuclear ribonucleoprotein is an experimental construct and does not correspond cleanly to a functional cellular entity. OBSOLETE. Particulate complex of heterogeneous nuclear RNA (hnRNA; a heterogeneous mixture of RNA molecules of high Mr with a rapid turnover rate that occurs in cell nuclei during protein synthesis; it is the form of RNA synthesized in eukaryotes by RNA polymerase II, that which is translated into protein) with protein, which is cell-specific and heterogeneous. The protein component may play a role in the processing of the hnRNA to mRNA. ribonucleoprotein complex