selective processing occurs since from pulse and pulse-chase experiments most if not all of the 15 s beta-globin rna is processed to mature 10 s beta-globin rna very rapidly , whereas less than 10 % of newly synthesised nuclear rna ( hnrna ) leaves the nucleus , the remainder being hydrolysed in the nucleus with a t 1/2 approx .
C0035700
nuclear rna
C0035695
hnrna