16767
In breast tumor cells , PTK6 promotes growth factor signaling and migration , and as such the semisynthetic sipholanes were evaluated for their ability to inhibit PTK6 phosphorylation in vitro .
 sipholanes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 sipholanes