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Table 1 Partition of H. sapiens and M. musculus genes into age groups

From: Codon usage is associated with the evolutionary age of genes in metazoan genomes

  Age group* # Genes Coding region GC content Protein length
    Mean SD Mean SD
  1 612 0.54 ± 0.10 363 ± 466
  2 97 0.53 ± 0.11 441 ± 352
  3 1202 0.54 ± 0.10 518 ± 504
  4 581 0.55 ± 0.09 531 ± 472
Human 5 648 0.52 ± 0.09 477 ± 424
  6 592 0.51 ± 0.09 681 ± 686
  7 605 0.53 ± 0.10 571 ± 400
  8 3914 0.54 ± 0.09 557 ± 498
  9 9023 0.53 ± 0.09 525 ± 399
  Total 17274     
  1 983 0.49 ± 0.10 384 ± 391
  2 39 0.51 ± 0.07 590 ± 446
  3 861 0.51 ± 0.07 534 ± 516
  4 854 0.50 ± 0.08 464 ± 428
Mouse 5 908 0.48 ± 0.07 414 ± 362
  6 708 0.50 ± 0.07 623 ± 659
  7 645 0.52 ± 0.07 555 ± 409
  8 4119 0.54 ± 0.07 546 ± 458
  9 9099 0.53 ± 0.06 526 ± 396
  Total 18216     
  1. *Ordinal evolutionary age, relative to the reference species under analysis
  2. Partition of all genes in H. sapiens and M. musculus into 9 non-overlapping age groups along the evolutionary tree. For each age group, the number of genes it contains, its average GC content (with standard deviation), and the average length of the proteins (number of amino acids/codons analyzed) that its genes encode (with standard deviation) are listed. The age groups are as in Figure 1.