Logically,the following "unnatural" amino acid would be substituted for which natural amino acid in the synthesis of peptide analogs? 
Definitions:
Visual Stimulus
Any object or event that is seen and stimulates the visual sense, leading to visual perception.
Depth
The quality of being profound (in thought, insight, or knowledge), or the apparent distance from the observer to the farthest point in a visual field, creating a three-dimensional perspective.
Perception
The cognitive process that enables us to interpret and organize sensory information to produce meaningful experiences of the world.
Sensation
The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
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