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Meningococcal vaccine in a vial, immunization and treatment of infection, scientific experiment
differentiation of b cell: upon antigen stimulation of surface receptor, plasma cell producing monoclonal antibodies are made, vector illustration eps.
Little girl with band aid on the shoulder from the injection. Vaccinated in the arm. Prevention of children diseases through vaccination. Health care and medicine concept. Focus on shoulder.
folinic acid molecule, structural chemical formula, ball-and-stick model, isolated image chemotherapy antidotes

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