15475
451 and 977 genes were differentially expressed in Caco - 2 cells exposed to HTy or HTy - Et for 24h , respectively , compared with untreated cells ( P < 0 . 005 ; FDR = 0 ) , using Affymetrix microarrays .
 Chemical: HTy; Chemical: HTy - Et
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: HTy; Chemical: HTy - Et