20883
The chemical reactivity of these 6 aldehydes toward a model hexapeptide was investigated , and their skin sensitization potencies were evaluated using the local lymph node assay ( LLNA ) .
 Chemical: aldehydes
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: aldehydes