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:
Corporate Campaign
A strategic effort undertaken by a group, often a trade union, to pressure a company to change its policies or behavior through public, financial, or political means.
Picket Lines
A boundary established by workers on strike, particularly outside their place of employment, to protest against their employer's practices.
Arbitration
A method of dispute resolution where an impartial third party, the arbitrator, makes a decision that is usually binding on the parties.
Grievance Procedures
Formalized means by which employees can submit complaints or disputes for resolution by the organization, following specific steps.
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