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We have a several clients in medical fields, and frequently need to add superscript references. WordPress doesn’t have this feature on its toolbar by default, but you can add it by adding this simple function to your active theme’s `functions.php` file

function enable_additional_mce_button($buttons) {
  $buttons[] = 'superscript';
  $buttons[] = 'subscript';
  return $buttons;
}
add_filter("mce_buttons_2", "enable_additional_mce_button");