Table 1. Sites of cleavage by directed hydroxyl radical probing.

Site of cleavage	Position of cysteine residue introduced
	mRNA + 0		mRNA + 21
	−RF2	+RF2	−RF2	+RF2
511–513	30, 47–50	30,47–50	30	30
520–521		2, 3, 22
531–532	2–6, 18, 22, 30–42	30	30	30
533–535	30, 47–50	30–34, 38, 39, 42, 47–50	30	30
1053–1055	2–32, 42	28	18, 42	18, 42
1195–1197	2–32, 36–39, 47, 50
1215	2–32
1230–1231	2–32
1398	2–6, 15, 18, 22, 26–30	26–30
1411–1412	6, 15, 18, 22, 27	15, 18, 22, 26	18	18