since u6 rna lacks the m3g residue and its rna does not react with anti-m3g , its co-chromatography with u4 rnp on anti-m3g affinity columns suggests either that discrete snrnps u4 and u6 are intimately associated in nuclear extracts or that both rnas are organized in one ribonucleoprotein particle .
C0035544
rnp
C0142661
snrnps