4699
These methods utilize the stereotypical growth pattern of primary rat cortical neurons in culture ( i . e . the Staging Method ) , as well as the differential cytoplasmic distribution of beta ( III ) - tubulin and MAP2 ( i . e . the Subtraction Method ) , to quantify inhibition of neurite initiation , axon outgrowth and secondary neurite ( or dendrite ) outgrowth in response to chemical exposure .
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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:
 None