621
Endothelial cell culture supernatants separated by ultrafiltration and ultracentrifugation from cells treated with EPO and IL - 3 significantly reduced thymidine incorporation into erythroid cells as compared to identical fractions obtained from the media of cells cultured with EPO alone .
 Chemical: thymidine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: thymidine 
Answer:
 Chemical: thymidine