19997
Using the Pfepf1 family promoter , we observed the specific downregulation of all four families , correlating with the inefficient release of merozoites while the parasite intra - erythrocytic maturation and Maurer ' s clefts morphology were not impacted .
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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