Logically,the following "unnatural" amino acid would be substituted for which natural amino acid in the synthesis of peptide analogs? 
Definitions:
Schedule-induced Polydipsia
An abnormal increase in drinking behavior that is observed in animals subjected to certain intermittent or unpredictable schedules of reinforcement, not directly related to the physiological demands for water.
Animal Model
A non-human animal used in scientific research to study biological processes, diseases, or behaviors that are similar to those in humans.
Human Alcoholism
A chronic condition characterized by uncontrolled drinking and preoccupation with alcohol, leading to physical dependence and various health issues.
Concurrent Interference Theory
A theory suggesting that the interference or disruption of processing multiple stimuli at the same time can affect learning or the performance of tasks.
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