Definition: You are given a sentence and your task is to generate another sentence that supports the given input.
Input: Composed mainly of hormone-producing chromaffin cells, the adrenal medulla is the principal site of the conversion of the amino acid tyrosine into the catecholamines epinephrine, norepinephrine, and dopamine.
Output:
Catecholamines are a class of amine hormones that when synthesised form the amino acid tyrosine.