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Recent investigations have shown that Grenz rays can suppress the allergic contact dermatitis reaction completely and that Langerhans cells , identified by OKT6 antibodies and electron microscopy , disappear from the epidermis at the same time .
 OKT6 antibodies
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 OKT6 antibodies