Compare, refer to.

The element cf. means "refer to". The abbreviation is most often seen in English writing. It may be used, for example, to invite readers to compare an author's discussion with that presented in another work, but the important fact to bear in mind is that cf. does not merely mean "see" or "see also".

The full Latin word confer is never seen in modern texts.

One of the most common hazardous genetic (inherited) diseases, cystic fibrosis affects the exocrine glands and is characterized by the production of abnormal secretions, leading to abnormally viscous mucus build-up.

This accumulation of mucus can impair the pancreas and, secondarily, the intestine. Mucous build-up in lungs tends progressively to impair respiration.

Without treatment, CF results in death for 95% of affected children before the age of five.