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We have described the isolation of chemically induced CEM subclones that express CD4 receptors and bind soluble gp120 , yet show a markedly reduced susceptibility to infection with HIV-1 .
 protein: gp120; cell line: CEM subclones; protein: CD4 receptors
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: gp120; cell line: CEM subclones; protein: CD4 receptors