Which of the following amino acids has a side chain with an ionizable proton and can exist in four different forms,depending on the pH of the solution? 
Definitions:
Decentralized Authority
A system where decision-making powers are distributed throughout various levels in an organization, rather than being concentrated at a single point.
Flat Structures
An organizational structure with few or no levels of middle management between staff and executives, promoting more direct communication.
Reducing Overhead Costs
Strategies aimed at decreasing the expenses not directly tied to the production of goods or services, such as rent, utilities, and administrative costs.
Spans of Control
The number of subordinates directly supervised by a manager, affecting the structure and efficiency of organizational communication and decision-making.
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