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In both T cells and HeLa cells HIV-1 Tat suppressed the expression of Mn-dependent superoxide dismutase ( Mn-SOD ), a mitochondrial enzyme that is part of the cellular defense system against oxidative stress .
 HeLa cells, HIV-1 Tat, mitochondrial enzyme, Mn-SOD, Mn-dependent superoxide dismutase, T cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 HeLa cells, HIV-1 Tat, mitochondrial enzyme, Mn-SOD, Mn-dependent superoxide dismutase, T cells