extension relation counts:
 count |           name            
-------+---------------------------
     3 | absent_during
    37 | activated_by
    41 | added_by
    39 | added_during
  1753 | assayed_using
    29 | dependent_on
   148 | during
   264 | exists_during
   259 | happens_during
   281 | has_direct_input
   231 | has_expressivity
   190 | has_input
   231 | has_penetrance
   336 | has_regulation_target
     2 | in_absence_of
    39 | independent_of
    59 | inhibited_by
    52 | in_presence_of
  5000 | is_a
     7 | is_bearer_of
     2 | level_fluctuates_during
    17 | localization_dependent_on
     1 | modified_by
     6 | not_during
     3 | not_exists_during
     4 | not_happens_during
     1 | not_occurs_at
    88 | occurs_at
    64 | occurs_in
     5 | 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
   624 | cellular_component
   728 | molecular_function
   728 | biological_process
  7236 | PSI-MOD
 10928 | fission_yeast_phenotype
 40333 | gene_ex
(7 rows)