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Here, we describe the characterization of an alternatively spliced variant of Spi-B , named deltaSpi-B , which has lost the Ets domain .
 Spi-B, Ets domain, deltaSpi-B
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Spi-B, Ets domain, deltaSpi-B