Logically,the following "unnatural" amino acid would be substituted for which natural amino acid in the synthesis of peptide analogs? 
Definitions:
Neutral-news Messages
Communications that convey information without any positive or negative implications, aiming to inform without influencing emotions.
Emotional Reaction
A spontaneous response involving feelings that occur as a result of stimuli, interactions, or events.
Effective Routine Requests
Communication strategies or messages designed to seek or secure assistance or information in a regular, day-to-day context efficiently.
Maximum Persuasion
The use of communication skills and techniques to their fullest extent to influence or convince others of a particular viewpoint, decision, or action.
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