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The BZLF1 gene promoter ( Zp ) was activated by crosslinking of cell surface immunoglobulin ( Ig ) with anti-Ig antibody in B cells , even in the absence of other viral genes.
 protein: cell surface immunoglobulin; cell type: B cells; protein: Ig; DNA: BZLF1 gene promoter; DNA: BZLF1 gene; DNA: Zp; protein: anti-Ig antibody
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: cell surface immunoglobulin, B cells, Ig, BZLF1 gene promoter, BZLF1 gene, Zp, anti-Ig antibody 
Answer:
 protein: cell surface immunoglobulin; cell type: B cells; protein: Ig; DNA: BZLF1 gene promoter; DNA: BZLF1 gene; DNA: Zp; protein: anti-Ig antibody