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Using mRNA differential display we demonstrated abnormally high expression of the signal transducer and activator of transcription ( STAT1alpha ) in monocytes from the proband II-2 .
 proband II-2, monocytes, STAT1alpha, signal transducer and activator of transcription
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:
 proband II-2, monocytes, STAT1alpha, signal transducer and activator of transcription