1945
The initial step of adhesion was mediated by sialyl Lewis ( x ) ( Le ( x ) ) and sialyl Le ( a ) , the carbohydrate determinants expressed on the cancer cells , and E - selectin expressed constitutively on F - 2 cells .
 cancer cells, F - 2 cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cancer cells, F - 2 cells