5145
Then , we investigated the cell cycle progression and apoptosis of MB cells ; 10 ( - 4 ) M BPA caused an explicit S phase and G2 / M phase arrest in the cell cycle and increased the percentage of apoptotic cells .
 BPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 BPA