25304
From 250 mu g / L at 72hpf the gap in the melanophore streak at the base of the tail fin was missing and the fin fold was abnormal , suggesting disturbance in the development of the adult tail fin primordium .
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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