TRACTS output:  RY tracts of E. coli.  (U00096):  

Short sample of some  longer tracts:
U00096       I -    I - 100.0  12  4608613  4608624 R.Y TTTCCCTTCCTT
U00096       C c    C c 100.0  12  4613067  4613078 R.Y AGGAGAAGGGGA
U00096       C c    C c 100.0  13  4613632  4613644 R.Y TCCCTTCTTTTTC
U00096       C c    I - 100.0  15  4614634  4614648 R.Y TCTTCTTTTCCTTTT
U00096       C x    C   100.0  12  4621717  4621728 R.Y CTCTTTTTTCTC
U00096       C c    C n 100.0  15  4621730  4621744 R.Y CTTTCTTCCTCTTCC
U00096       C w    C w 100.0  12  4629327  4629338 R.Y GAAAGAGAAAGA
U00096       C w    C w 100.0  14  4631657  4631670 R.Y GAAGAAGAAGAGAA
U00096       C w    C w 100.0  12  4635014  4635025 R.Y GGAAGGGAAAAA

           ---------- SEQUENCES ----------     ----------  BASES  -----------    ------- BASES GE. --------
 LENGTH PYRS   PURS   SUM   EXPCTD     DIFF  FOUND  EXPECTD   DIFF     RATIO   CUMULTV.  FOUND EXPCTD    RATIO

   1 601215 6020181203233 *********  43427.812032331159805.25 43427.75     1.04 1203233 46392214639221.00     1.00
   2 350806 350931 701737 579902.62 121834.414034741159805.25243668.75     1.21 2606707 34359883479416.50     0.99
   3 129188 128563 257751 289951.31 -32200.3 773253 869853.94-96600.94     0.89 3379960 20325142319611.25     0.88
   4  60444  60337 120781 144975.69 -24194.7 483124 579902.75-96778.75     0.83 3863084 12592611449757.75     0.87
   5  32092  31641  63733  72487.85  -8754.9 318665 362439.25-43774.25     0.88 4181749  776137 869854.69     0.89
   6  15531  15417  30948  36243.94  -5295.9 185688 217463.62-31775.62     0.85 4367437  457472 507415.41     0.90
   7   7929   8104  16033  18121.98  -2089.0 112231 126853.84-14622.84     0.88 4479668  271784 289951.78     0.94
   8   4270   4503   8773   9060.99   -288.0  70184  72487.94 -2303.94     0.97 4549852  159553 163098.03     0.98
   9   2094   2010   4104   4530.50   -426.5  36936  40774.49 -3838.49     0.91 4586788   89369  90610.05     0.99
  10   1125   1148   2273   2265.25      7.7  22730  22652.51    77.49     1.00 4609518   52433  49835.56     1.05
  11    592    613   1205   1132.63     72.4  13255  12458.89   796.11     1.06 4622773   29703  27183.06     1.09
  12    307    286    593    566.31     26.7   7116   6795.76   320.24     1.05 4629889   16448  14724.17     1.12
  13    138    145    283    283.16     -0.2   3679   3681.04    -2.04     1.00 4633568    9332   7928.41     1.18
  14     79     93    172    141.58     30.4   2408   1982.10   425.90     1.21 4635976    5653   4247.37     1.33
  15     41     44     85     70.79     14.2   1275   1061.84   213.16     1.20 4637251    3245   2265.26     1.43
  16     21     31     52     35.39     16.6    832    566.32   265.68     1.47 4638083    1970   1203.42     1.64
  17     18     11     29     17.70     11.3    493    300.86   192.14     1.64 4638576    1138    637.11     1.79
  18      3      4      7      8.85     -1.8    126    159.28   -33.28     0.79 4638702     645    336.25     1.92
  19      6      2      8      4.42      3.6    152     84.06    67.94     1.81 4638854     519    176.97     2.93
  20      2      5      7      2.21      4.8    140     44.24    95.76     3.16 4638994     367     92.91     3.95
  21      6      0      6      1.11      4.9    126     23.23   102.77     5.42 4639120     227     48.67     4.66
  22      1      1      2      0.55      1.4     44     12.17    31.83     3.62 4639164     101     25.44     3.97
  28      0      1      1      0.01      1.0     28      0.24    27.76   115.72 4639192      57      0.50   113.73
  29      1      0      1      0.00      1.0     29      0.13    28.87   231.44 4639221      29      0.26   111.86

 SUM              2411817                  4639221 (:2 =********)             DEVIATION:     -3.98%  %A,G =  0.500


               Summary for RY sequences .GE.12 at level 100%

                   CODING    INTERCODING        INTRONS    TOTAL BASES
 TOTAL:           4133682         505539              0        4639221
 FOUND:             11510           4938              0          16448
 EXPECTED:       13119.67        1604.50           0.00       14724.17
 RATIO:              0.88           3.08           0.00           1.12

        ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
      1 AGCTTTTCAT TCTGACTGCA ACGGGCAATA TGTCTCTGTG TGGATTAAAA AAAGAGTGTC TGATAGCAGC TTCTGAACTG GTTACCTGCC GTGAGTAAAT     100
                                               KKKK KKKWWWRRRR RRRRRR                                           WWWWW