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Krishna S, Maduzia LL, Padgett RW (January 1999). "Specificity of TGFbeta signaling is conferred by distinct type I receptors and their associated SMAD proteins in Caenorhabditis elegans". Development. 126 (2): 251–60. doi:10.1242/dev.126.2.251. PMID9847239. S2CID2460114.