2209
Hetero - oligomerization of Smad4 with the pathway - restricted SMAD proteins is essential for Smad4 - mediated transcription .
 GENE: Smad4; GENE: SMAD proteins; GENE: Smad4
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: Smad4; GENE: SMAD proteins; GENE: Smad4