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Table 2 Di-nucleotide bias for six RNA viruses.

From: Relationship of SARS-CoV to other pathogenic RNA viruses explored by tetranucleotide usage profiling

  BCoV MHV SARS ABV HCoV PDV Average z value
across 31 viruses
Di-nucleotide N(w) E(w) z N(w) E(w) z N(w) E(w) z N(w) E(w) z N(w) E(w) z N(w) E(w) z  
CG 497 1034 -103.81 798 1342 -104.39 566 1235 -121-14 486 976 -109.69 487 979 -95.94 684 1226 -102.03 -77.31
GC 1344 1037 62.19 1694 1341 62.33 1432 1236 36.12 1147 970 35.96 1164 976 37.86 1416 1228 35.05 5.74
AU 2845 3007 -26.44 2499 2614 -19.25 2234 2594 -58.91 2200 2642 -76.99 2092 2556 -81.97 1976 2296 -55.43 -15.54
UA 2818 3000 -30.10 2404 2616 -35.12 2080 2594 -87.64 2409 2641 -42.42 2033 2554 -84.51 1965 2299 -53.83 -52.48
AG 1824 1848 -4.25 1968 1941 4.77 1749 1760 -2.00 1844 1728 21.13 1416 1601 -34.78 1537 1579 -7.12 3.80
GA 1629 1849 -39.08 1745 1941 -32.74 1677 1764 -16.43 1505 1730 -39.47 1397 1598 -36.09 1358 1581 -38.05 -1.33
AC 1371 1303 12.93 1384 1458 -13.50 1978 1695 50.18 1474 1292 35.28 1558 1236 58.96 1594 1332 50.25 5.42
CA 1594 1297 56.03 1705 1453 46.19 2203 1695 87.29 1603 1290 59.90 1638 1234 74.68 1783 1327 83.96 49.99
CU 1801 1674 22.52 1874 1806 12.28 2190 1814 67.50 1661 1487 31.50 1724 1568 28.13 1953 1784 29.95 16.50
UC 1179 1674 -88.35 1296 1802 -94.30 1552 1815 -46.36 1127 1482 -65.41 1130 1568 -79.37 1410 1781 -67.80 -17.49
GU 2449 2394 9.10 2473 2402 11.92 1868 1898 -5.35 2154 1982 29.46 2240 2044 34.60 2262 2119 23.86 -7.13
UG 3101 2392 120.25 3146 2408 128.13 2663 1897 137.30 2476 1983 87.74 2898 2040 152.24 2814 2117 126.99 65.79
  1. The di-nucleotide bias in six RNA viruses. The z value quantifies the di-nucleotide bias as defined in equation 1. N (w) and E (w) are actual and expected frequency of occurrence for word w. The last column is the average z value across 31 RNA viruses.