Statistical Comparison of Orphan and Nonorphan cDNAs
Orphans | Nonorphans | ||
|---|---|---|---|
| No. | 106 | 586 | |
| mean ± 1SE | mean ± 1SE | P | |
| aa length | 224 ± 13 | 356 ± 14 | 7.5 × 10−7 |
| GC | 0.541 ± 0.0050 | 0.553 ± 0.0020 | 0.026 |
| GC3 | 0.638 ± 0.0122 | 0.688 ± 0.0049 | 8.6 × 10−5 |
| ENC | 47.7 ± 0.79 | 44.22 ± 0.35 | 1.2 × 10−4 |
| Fop | 0.527 ± 0.0120 | 0.591 ± 0.0054 | 2.8 × 10−6 |
| Exon number | 2.5 ± 0.16 | 3.5 ± 0.09 | 1.2 × 10−7 |
[i] Mean and standard errors of the mean are given. Significance of differences were tested using Student's t. Values are derived from the full-length D. melanogaster homolog of the D. yakuba cDNAs. GC, general GC content; GC3, GC content at third codon positions. ENC (effective number of codons) and Fop (frequency of optimal codons) are measures of codon usage bias.