extension relation counts:
 count |           name            
-------+---------------------------
     3 | absent_during
    39 | activated_by
    47 | added_by
    43 | added_during
  2131 | assayed_using
    31 | dependent_on
   159 | during
   276 | exists_during
   253 | happens_during
   314 | has_direct_input
   272 | has_expressivity
   200 | has_input
   264 | has_penetrance
   346 | has_regulation_target
     2 | in_absence_of
    41 | independent_of
    61 | inhibited_by
    56 | in_presence_of
  5557 | is_a
     7 | is_bearer_of
     2 | level_fluctuates_during
    17 | localization_dependent_on
     1 | modified_by
     6 | not_during
     3 | not_exists_during
     3 | not_happens_during
     1 | not_occurs_at
    89 | occurs_at
    64 | occurs_in
     8 | part_of
    23 | present_during
     8 | removed_by
     7 | 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
   640 | cellular_component
   731 | biological_process
   778 | molecular_function
  7255 | PSI-MOD
 11722 | fission_yeast_phenotype
 40403 | gene_ex
(7 rows)