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The studies described here provide the first full description of sialic acid - dependent molecular interactions at the P . falciparum erythrocyte invasion interface and define a framework for development of PfEBA - 140 - based therapeutics , vaccines , and diagnostics assessing vaccine efficacy and natural immunity to infection .
 Chemical: sialic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sialic acid