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These mutations were introduced in the tax gene of the ACH functional molecular clone of HTLV-1 , and virus produced from the mutant ACH clones was examined for the ability to replicate and immortalize primary human lymphocytes .
 ACH functional molecular clone, mutant ACH clones, tax gene, primary human lymphocytes
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:
 ACH functional molecular clone, mutant ACH clones, tax gene, primary human lymphocytes