Which step serves as the rate-limiting stage in the biosynthesis of adrenaline?

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Conversion of tyrosine into dopaTransformation of phenylalanine into tyrosineChange of dopa to dopamineConversion of dopamine to norepinephrine

Explanation

The rate-limiting step in adrenaline production is the conversion of tyrosine to dopa. This step controls the overall speed of the synthesis pathway, unlike subsequent transformations such as phenylalanine to tyrosine, dopa to dopamine, or dopamine to norepinephrine.