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There is an error at the beginning of the first sentence of the Abstract. {Chung, 2009 #1} is not the appropriate start of the Abstract. The correct sentence is: "The transforming growth factor-β (TGF-β) superfamily of cytokines plays a fundamental role in a wide variety of cellular processes, including growth, differentiation, apoptosis, and tissue homeostasis."
Competing Interests: No competing interests declared.
