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In contrast , the highest dose of melatonin ( 50 mg / kg ) caused a paradoxical increase in the latency and produced a sustained reduction of the duration of narcosis , and a reduction in mortality rate .
 Chemical: melatonin; Disease: narcosis
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: melatonin; Disease: narcosis