MARTIN SHIELDS / SCIENCE PHOTO LIBRARY MARTIN SHIELDS / SCIENCE PHOTO LIBRARY
A pre-filled syringe of Etanercept (brand name Enbrel). The genetically engineered drug is a treatment for autoimmune diseases such as rheumatoid arthritis and psoriasis. It is a protein that binds to receptors for and blocks the action of the immune system cytokine, tumor necrosis factor alpha.
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