20986
This relationship improved when only saturated concentrations were evaluated ( r ( 2 ) = 0 . 60 , 0 . 63 and 0 . 66 for the Strat - M (TM) , certramide and IPM membranes , respectively ) .
 certramide, IPM
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 certramide, IPM