Fixed width sequence classes

Author: aaronkw

docs/sei.rst

@@ -21,7 +21,8 @@ The Sei framework predicts 40 sequence class scores, covering a wide range of re
 
 To help interpretation, we grouped sequence classes into groups including P (Promoter), E (Enhancer), CTCF (CTCF-cohesin binding), TF (TF binding), PC (Polycomb-repressed), HET (Heterochromatin), TN (Transcription), and L (Low Signal) sequence classes. Please refer to our manuscript for a more detailed description of the sequence classes.
 
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   | Sequence class label |               Sequence class name | Rank by size | Group |
   |---------------------:|----------------------------------:|-------------:|------:|
   |                 PC1  |       Polycomb / Heterochromatin  |            0 |   PC  |