TABLE 1.

Stalling peptides isolated from the KanR selection

The variable region (six codons) is shown in bold. Class I contains Pro-stop residues at the third and fourth variable positions. Class II contains a Pro-Pro sequence at positions three and four with no nearby stop codon. Class III contains Trp-Pro-Pro at the first three positions without an adjacent stop codon.

Class I: Pro-stop	G I S E P * (opal)
	G I K D P * (amber)
	G I W P P * (opal)
Class II: Pro-Pro	G I R A P P H C G T
	G I R S P P N S G T
	G I L D P P G M G T
Class III: Trp-Pro-Pro	G I W P P W Y R G T
	G I W P P D V * (opal)
	G I W P P P S I G T