Table 4.

The difference (Fd-Fs) in average amino acid frequencies in the C-terminal position of proteins encoded by the samples of A. thaliana mRNAs with double (Fd) or single (Fs) stop codons (statistical significance was evaluated with Mann-Whitney U-test; significantly different values were bolded). The samples with terminators UAA, UGA and UAG were analyzed separately.

	UAA	Z score	UGA	Z score	UAG	Z score
Ala	−0.002	0.162	−0.005	0.451	−0.022	1.272
Cys	−0.003	0.290	0.007	−1.093	−0.009	0.899
Asp	0.005	−0.481	0.004	−0.405	0.011	−0.726
Glu	0.015	−1.300	0.002	−0.182	0.024	−1.574
Phe	−0.015	1.276	−0.012	1.241	−0.044	2.785
Gly	−0.007	0.637	0.039	−4.990	0.014	−1.268
His	−0.013	1.407	0.008	−1.097	0.003	−0.294
Ile	−0.004	0.394	−0.007	0.767	−0.006	0.399
Lys	0.023	−1.759	−0.001	0.069	−0.027	1.602
Leu	−0.010	0.617	−0.027	2.092	−0.029	1.388
Met	0.016	−1.915	−0.001	0.092	0.009	−0.915
Asn	0.016	−1.281	0.004	−0.405	0.013	−0.832
Pro	−0.015	1.368	−0.023	2.554	−0.010	0.790
Gln	0.015	−1.565	0.007	−0.899	0.012	−0.994
Arg	0.013	−1.062	0.028	−2.525	−0.006	0.353
Ser	−0.021	1.314	−0.010	0.773	−0.005	0.225
Thr	−0.023	1.934	−0.011	1.176	−0.017	1.285
Val	0.014	−1.044	−0.003	0.284	0.054	−3.248
Trp	0.002	−0.378	−0.001	0.124	0.014	−1.943
Tyr	−0.006	0.640	0.001	−0.123	0.020	−1.497