22333
Specific molecular interactions that enable receptor engagement are identified and reveal that the glycan binding mode is distinct from that of apicomplexan and viral cell surface recognition ligands as well as host immune factors that bind sialic acid .
 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