The formation of snRNP The snrna are synthesized in nucleus by rna Pol ll and have a normal 5-cap hey are exported to the cytoplasm where they associate with the common core protein and other specific protein. Their 5-cap gains two methyl groups and they are then imported back into nucleus where they function in splicing.The formation of snRNP : The snRNA are synthesized in nucleus by RNA Pol II and have a normal 5’-cap. They are exported to the cytoplasm where they associate with the common core protein and other specific protein. Their 5’-cap gains two methyl groups and they are then imported back into nucleus where they function in splicing