Complete the following tree of reactions by giving the major products. 
Definitions:
Melatonin
A substance created by the pineal gland responsible for controlling sleep and wakefulness cycles.
Islets of Langerhans
Clusters of pancreatic cells that produce hormones, including insulin, critical for regulating blood sugar levels.
Glucagon
Glucagon is a hormone produced by the pancreas that increases blood glucose levels by stimulating the liver to convert stored glycogen into glucose.
Insulin
An agent generated in the pancreas that manages the concentration of glucose in the bloodstream by aiding the absorption of glucose by the body's tissues.
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