4600
Using a combination of two dimensional electrophoresis ( 2 - DE ) and MALDI - TOF mass spectrometry , a total of 125 proteins and their post - translational modification forms or isoforms were found to be differentially expressed in the cell lines .
 cell lines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 cell lines