immunoprecipitation of human small nuclear ribonucleoproteins ( snrnps ) containing the small nuclear rnas u1 , u2 , u4 , u5 , and u6 with two antibodies produced in certain patients suffering from systemic lupus erythematosus was used to identify the polypeptides present on human u1 and u2 snrnps .
C0142661
small nuclear ribonucleoproteins
C0035709
small nuclear rnas