extension relation counts:
 count |           name            
-------+---------------------------
     8 | absent_during
    49 | activated_by
    72 | added_by
    61 | added_during
  2888 | assayed_using
    15 | coincident_with
    29 | dependent_on
   179 | during
   342 | exists_during
   253 | happens_during
   352 | has_direct_input
   371 | has_expressivity
   198 | has_input
   453 | has_penetrance
   330 | has_regulation_target
     2 | in_absence_of
    46 | independent_of
    64 | inhibited_by
    60 | in_presence_of
     7 | is_bearer_of
     2 | level_fluctuates_during
    15 | localization_dependent_on
     3 | not_during
     6 | not_exists_during
     1 | not_happens_during
     1 | not_occurs_at
    97 | occurs_at
    55 | occurs_in
    13 | part_of
    43 | present_during
    10 | removed_by
    11 | removed_during
     7 | requires_modification
    21 | requires_sequence_feature
     9 | requires_substance
(35 rows)


number of annotations using extensions by cv:
 count |      base_cv_name       
-------+-------------------------
     1 | name_description
   712 | biological_process
   807 | cellular_component
   865 | molecular_function
  7305 | PSI-MOD
 13996 | fission_yeast_phenotype
 36524 | gene_ex
(7 rows)