In general the Ensembl schema aims to give each feature type its own table. This is somewhat impractical if you have only a small number of new features to introduce or if the new feature does not add any extra functionality.
A misc_feature is a general feature.
It can have a location (misc_feature.seq_region_id/start/end/strand), a number of self defined attributes (misc_attribute.value) and self defined attribute types (attrib_type.code).
Misc_features can belong to one or more sets of features (
The columns attrib_type.code and misc_set.code are used to identify a certain attribute type or misc set to the API. For display purposes the value in the name column should be used. The description column is optional.
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