Which of the following is a predominant form of serine at physiological pH? 
Definitions:
Perceptiveness
the ability to notice or understand things quickly and accurately, especially those that are not obvious.
Frames of Reference
The perspectives, experiences, or contexts through which individuals interpret information or situations.
Channel Overload
A situation where the amount of information or the number of communication channels becomes overwhelming, leading to decreased effectiveness in communication.
Decoding
the process of interpreting or making sense of a message, code, or information.
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