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Observed and expected codon usage at P2 for secretory group
| Codon | Amino Acid | Observed | Expected |
|---|---|---|---|
| UCU | Ser | 4 | 13 |
| UCC | Ser | 7 | 7 |
| UCA | Ser | 2 | 9 |
| UCG | Ser | 2 | 5 |
| AGU | Ser | 13 | 20 |
| AGC | Ser | 7 | 19 |
| AAU | Asn | 25 | 23 |
| AAC | Asn | 18 | 14 |
| AAA | Lys | 138a | 53 |
| AAG | Lys | 32 | 13 |
| CGU | Arg | 16 | 8 |
| CGC | Arg | 10 | 6 |
| CGA | Arg | 4 | 4 |
| CGG | Arg | 3 | 2 |
| AGA | Arg | 7 | 4 |
| AGG | Arg | 2 | 1 |
aP-value is 1.79 × 10−7 calculated using a χ2 test with 60 degrees of freedom. Expected values were calculated using the frequency of codon usage of all genes in the E. coli genome.
