Provide a detailed, stepwise mechanism for the following reactions. 
Definitions:
Growth Factors
Naturally occurring substances capable of stimulating cellular growth, proliferation, and cellular differentiation, usually considered essential for cell signaling.
Exocrine Role
Refers to the function of exocrine glands in secreting substances through ducts to an external or internal surface.
Pancreas
A glandular organ in the digestive and endocrine system of vertebrates producing digestive enzymes and hormones like insulin.
Pheromones
Chemical substances produced and released into the environment by an animal, affecting the behavior or physiology of others of its own species.
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