Protein markers react with specific , which are proteins found in the immune system. A. antigen

B. immunity

C. antibody

D white blood cells

Protein markers react with specific antibody, which are proteins found in the immune system.

Proteins are large micromolecules and macromolecules that comprise one or more long chains of amino acids.

The major proteins found in the immune system are  cytokines, antibodies, and complement proteins.

Thus, Protein markers react with specific antibody, which are proteins found in the immune system.

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b. regulated is the actual answer to your question.

explanation: