8235
Reverse transcriptase polymerase chain reaction and Northern analyses confirmed that normal and leukemic myeloid progenitor cells expressed mRNA for the type I and IV isoforms of 17 beta-hydroxysteroid dehydrogenase .
 ( RNA: mRNA, None) , ( protein: 17 beta-hydroxysteroid dehydrogenase, None) , ( cell type: myeloid progenitor cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( RNA: mRNA, None) , ( protein: 17 beta-hydroxysteroid dehydrogenase, None) , ( cell type: myeloid progenitor cells, None) 