20094
Genome - wide transcriptome analysis substantiated these findings by showing ( 1 ) a delay in the onset of gene expression related to neural development , and ( 2 ) alterations in pathways related to both structural and functional aspects of nervous system development .
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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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