A NUMBER OF AUTOCRINE MOLECULES ARE DERIVED FROM THE FATTY ACID ARACHIDONIC ACID.  THESE INCLUDE THE   THE EICANOSOIDS. EXAMPLES OF THESE INCLUDE:   PROSTAGLANDINS:  CELLS THROUGHOUT THE BODY SECRETE A VARIETY OF PROSTAGLANDINS.  THESE MODIFIED FATTY ACID SECRETIONS HAVE A VARIETY OF FUNCTIONS.  THESE INCLUDE:  INCREASE UTERINE CONTRACTIONS, OVULATION, BLOOD COAGULATION, MEDIATION OF THE INFLAMMATORY RESPONSE AND MORE.   PROSTACYCLINS:  CELLS THROUGHOUT THE BODY PRODUCE THE PROSTACYCLINS, WHICH HAVE A ROLE IN MEDIATING THE INFLAMMATORY RESPONSE AND A VARIETY OF OTHER FUNCTIONS.   THROMBOXANES :  CELLS THROUGHOUT THE BODY PRODUCE THROMBOXANES, WHICH HAVE A ROLE IN MEDIATING THE INFLAMMATORY RESPONSE AND A VARIETY OF OTHER FUNCTIONS.   LEUKOTRIENES:  CELLS THROUGHOUT THE BODY PRODUCE LEUKOTRIENES, WHICH HAVE A ROLE IN MEDIATING THE INFLAMMATORY RESPONSE, CONSTRICTION OF THE BRONCHIOLES IN ASTHMA AND A VARIETY OF OTHER FUNCTIONS.   A NUMBER OF PARACRINE MOLECULES ARE PEPTIDES OR PROTEINS.  EXAMPLES OF THESE INCLUDE:   ENKEPHALINS:  THESE PEPTIDE MOLECULES ARE PRODUCED BY CELLS OF THE NERVOUS SYSTEM AND HAVE A NUMBER OF FUNCTIONS, THE MOST OBVIOUS BEING THE REDUCTION OF PAIN SENSATION.   ENDORPHINS:  THESE PEPTIDE MOLECULES ARE PRODUCED BY CELLS OF THE NERVOUS SYSTEM AND HAVE A NUMBER OF FUNCTIONS, THE MOST OBVIOUS BEING THE REDUCTION OF PAIN SENSATION.   INTERLEUKIN-2  THIS PROTEIN MOLECULE IS PRODUCED BY CELLS OF THE IMMUNE SYSTEM AND STIMULATES THE DIVISION OF T LYMPHOCYTES AND OTHER FUNCTIONS.