immunoprecipitations of nuclear and cytoplasmic fractions after a pulse label and chase indicate that the snrnp d , e , f , and g proteins assemble first , followed by the small nuclear rna ( snrna ) , then the snrnp b protein and , in the case of the u1 snrnp , the a and c proteins .
C0142661
snrnp
C0162795
u1 snrnp