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We also found differential expression of the Ca2+ -independent isoforms in alveolar macrophages compared with monocytes .
 Ca2+ -independent isoforms, alveolar macrophages, monocytes
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:
 Ca2+ -independent isoforms, alveolar macrophages, monocytes