Table 2.

Tryptic Digest of RbcL from tada-1

	m/z Observed	z	Mr Calc	Sequence	Ion Score
RbcL	511.2719	+2	1020.524	DTDILAAFR41	59
	625.3409	+3	1248.6714	ESTLGFVDLLR350	75
AtpA	626.8563	+2	1251.6935	VINALANPIDGR119	49
	737.8978	+2	1473.7787	ASSVAQVVTSLQER216	52
AtpB	978.0159	+2	1954.016	(R109)IFNVLGEPVDNLGPVDTR127	94
	736.3841	+2	1470.7541	VGLTALTMAEYFR261	89
	1031.0219	+2	2060.0248	GIYPAVDPLDSTSTMLQPR378	69

After mass spectrometry analysis of the RbcL band of tada-1, 31 peptides derived from RbcL, AtpB, and AtpA were unambiguously identified. Only peptides corresponding to cleavage at potentially mistranslated Arg residues (in bold) are listed in this table. Ions score is −10*Log(P), where P is the probability that the observed match is a random event. Ions scores >29 indicate identity or extensive homology (P < 0.05). Mr Calc, relative mass calculated from the mass-to-charge (m/z) ratio. The full list of ions observed during this experiment is available in the Supplemental Data Set 1.