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Small nuclear RNA ( snRNP , or ' snurps ' ) , joins with proteins to form spliceosomes .
snRNPs ( pronounced " snurps " ) , or small nuclear ribonucleoproteins , are RNA-protein complexes that combine with unmodified pre-mRNA and various other proteins to form a spliceosome , a large RNA-protein molecular complex upon which splicing of pre-mRNA occurs .