1520
Our experimental data confirm previous studies showing the in vitro cell growth inhibition of the transitional cell carcinoma of the bladder cell line HTB9 and further showed the induction of cell cycle arrest at the S / G2 - M checkpoints .
 cell, transitional cell carcinoma, bladder cell line HTB9, cell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cell, transitional cell carcinoma, bladder cell line HTB9, cell