DNase-free RNase was obtained from Boehringer Mannheim. Luria-Bertani (LB) medium and LB agar medium capsules were from BIO 101 (La Jolla, CA). Tryptic soy broth (TSB) was obtained from Remel (Lenexa, KS). Na125I, [γ-32P]ATP, and [α-32P]CTP were from ICN (Costa Mesa, CA). ...