 	study_id int(10) unsigned not null auto_increment,
 	source_id int(10) unsigned not null,
 	name varchar(255) DEFAULT null,
-	description varchar(255) DEFAULT NULL,
+	description text DEFAULT NULL,
 	url varchar(255) DEFAULT NULL,
 	external_reference varchar(255) DEFAULT NULL,
 	study_type varchar(255) DEFAULT NULL,

@column variation_set_id		             The structural variation feature can belong to a @link variation_set.
@column somatic                          Flags whether this structural variation is known to be somatic or not
@column breakpoint_order                 Defines the order of the breakpoints when several events/mutation occured for a structural variation (e.g. somatic mutations)

@see structural_variation
@see source
@see seq_region
@see attrib
@see variation_set

  KEY name_idx (variation_name),
	KEY source_idx (source_id),
	KEY study_idx (study_id),
	KEY attrib_idx (class_attrib_id),
	KEY clinical_attrib_idx (clinical_significance_attrib_id)
);


