18859
However , of interest , although in vitro sphere formation ability of ALDH + cells was almost unchanged after SNAIL induction , SNAIL overexpression induced much higher ( ~ 14 fold ) spheres in ALDH - cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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