7716
However, Spi-C may represent a novel subgroup within the Ets protein family , as it differed significantly from Spi-B and PU.1 within helix 1 of the Ets domain .
 protein: helix 1; protein: Ets protein family; protein: Ets domain; protein: Spi-B; protein: PU.1; protein: Spi-C; protein: Ets protein
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: helix 1, Ets protein family, Ets domain, Spi-B, PU.1, Spi-C, Ets protein 
Answer:
 protein: helix 1; protein: Ets protein family; protein: Ets domain; protein: Spi-B; protein: PU.1; protein: Spi-C; protein: Ets protein