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Electrophoretic mobility - shift assays with nuclear extracts from COS - 1 cells transfected with expression vectors for SMADs 1 - 5 indicate that SMAD3 forms a complex with a migration similar to that of the endogenous TGF - beta - specific complex observed in fibroblast extracts .
 GENE: SMADs 1 - 5; GENE: SMAD3; GENE: endogenous TGF - beta - specific complex
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: SMADs 1 - 5; GENE: SMAD3; GENE: endogenous TGF - beta - specific complex