20923
The results of Experiment 1 indicated that cells exposed to Cu alone for 24h exhibited increases in lactate dehydrogenase release ( LDH ) , malondialdehyde ( MDA ) formation and protein oxidation ( P < 0 . 05 ) .
 Cu, lactate, malondialdehyde, MDA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Cu, lactate, malondialdehyde, MDA