in cell-free systems , 2-5a [ ppp ( a2 ' p ) na , n = 2 to greater than or equal to 4 ] activates a latent endoribonuclease , the 2-5a-dependent rnase , which cleaves rrna in intact ribosomes into discrete and characteristic products ( d .
C0035701
rrna
C0035553
ribosomes