extension relation counts:
 count |           name            
-------+---------------------------
     3 | absent_during
    45 | activated_by
    54 | added_by
    45 | added_during
  2276 | assayed_using
    33 | dependent_on
   168 | during
   303 | exists_during
   255 | happens_during
   330 | has_direct_input
   318 | has_expressivity
   204 | has_input
   321 | has_penetrance
   348 | has_regulation_target
     2 | in_absence_of
    63 | inhibited_by
    59 | in_presence_of
  5864 | is_a
     7 | is_bearer_of
     2 | level_fluctuates_during
    17 | localization_dependent_on
     1 | modified_by
    46 | not_dependent_on
     6 | not_during
     4 | not_exists_during
     3 | not_happens_during
     1 | not_occurs_at
    96 | occurs_at
    64 | occurs_in
     8 | part_of
    24 | present_during
     8 | removed_by
     8 | removed_during
     1 | required_for
     8 | requires_modification
    24 | requires_sequence_feature
     9 | requires_substance
(37 rows)


number of annotations using extensions by cv:
 count |      base_cv_name       
-------+-------------------------
     1 | name_description
   705 | cellular_component
   735 | biological_process
   804 | molecular_function
  7270 | PSI-MOD
 12575 | fission_yeast_phenotype
 38717 | gene_ex
(7 rows)