6610
Targeted expression to specific tissues or cell lineages is a necessary feature of a gene therapy vector for many clinical applications , such as correction of hemoglobinopathies or thalassemias by transplantation of genetically modified hematopoietic stem cells .
 ( cell type: genetically modified hematopoietic stem 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:
 ( cell type: genetically modified hematopoietic stem cells, None) 