extension relation counts:
 count |           name            
-------+---------------------------
     3 | absent_during
    44 | activated_by
    67 | added_by
    52 | added_during
  2775 | assayed_using
    10 | coincident_with
    31 | dependent_on
   191 | during
   330 | exists_during
   267 | happens_during
   347 | has_direct_input
   354 | has_expressivity
   194 | has_input
   348 | has_penetrance
   337 | 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
    17 | localization_dependent_on
     1 | modified_by
     7 | not_during
     6 | not_exists_during
     3 | not_happens_during
     1 | not_occurs_at
   101 | occurs_at
    56 | occurs_in
    14 | part_of
    29 | present_during
     8 | removed_by
    10 | removed_during
     1 | required_for
     8 | requires_modification
    23 | requires_sequence_feature
     9 | requires_substance
(37 rows)


number of annotations using extensions by cv:
 count |      base_cv_name       
-------+-------------------------
     1 | name_description
   728 | biological_process
   780 | cellular_component
   859 | molecular_function
  7300 | PSI-MOD
 13675 | fission_yeast_phenotype
 36505 | gene_ex
(7 rows)