6180
Therefore , the ' human embryonic stem cell ( hESC ) - derived novel alternative test systems ( ESNATS ) ' European commission research project established RT tests based on defined differentiation protocols of hESC and their progeny .
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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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