19994
We report here the characterization of three new P . falciparum multigene families organized in 9 highly conserved clusters with the Pfmc - 2tm genes in the subtelomeric regions of parasite ' s chromosomes and expressed at early trophozoite stages .
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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 
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Answer:
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