18261
In Drosophila postembryonic neuroblasts , transition in gene expression programs of a cascade of transcription factors ( also known as the temporal series ) acts together with the asymmetric division machinery to generate diverse neurons with distinct identities and regulate the end of neuroblast proliferation .
 None
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