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By primer extension analysis to discriminate two transcripts, we found that the levels of PAFR transcript 1 ( leukocyte-type ), but not PAFR transcript 2 ( tissue-type ), are upregulated by PAF as well as by 12-O-tetradecanoylphorbol-13-acetate ( TPA ) in the human stomach cancer cell line ( JR-St cells ) which expresses both functional PAFR transcript 1 and PAFR transcript 2 endogenously.
 PAF, JR-St cells, PAFR, PAFR, PAFR transcript 2, PAFR transcript 1, PAFR transcript 1, PAFR transcript 2, PAFR, PAFR, human stomach cancer cell line
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:
 PAF, JR-St cells, PAFR, PAFR, PAFR transcript 2, PAFR transcript 1, PAFR transcript 1, PAFR transcript 2, PAFR, PAFR, human stomach cancer cell line