Answer :
Protein markers react with specific antibody, which are proteins found in the immune system.
What is protein?
Proteins are large micromolecules and macromolecules that comprise one or more long chains of amino acids.
Proteins found in immune system
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.
Learn ore about protein here: https://brainly.com/question/10058019