7269
Single-cell reverse transcriptase -polymerase chain reaction ( RT-PCR ) analysis was applied to this culture system to investigate gene expression of diverse receptors , markers of differentiation , and transcription factors ( EKLF , GATA-1 , GATA-2 , p45 NF-E2 , PU.1 , and SCL/Tal1 ) at discrete stages of erythropoietic development .
 protein: receptors; protein: p45 NF-E2; protein: GATA-1; protein: markers of differentiation; protein: reverse transcriptase; protein: GATA-2; protein: transcription factors; protein: PU.1; protein: SCL/Tal1; protein: EKLF
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: receptors, p45 NF-E2, GATA-1, markers of differentiation, reverse transcriptase, GATA-2, transcription factors, PU.1, SCL/Tal1, EKLF 
Answer:
 protein: receptors; protein: p45 NF-E2; protein: GATA-1; protein: markers of differentiation; protein: reverse transcriptase; protein: GATA-2; protein: transcription factors; protein: PU.1; protein: SCL/Tal1; protein: EKLF