13961
Proerythroblasts and megakaryocytes massively accumulated in the spleens of the heterozygotes , and we showed that the neomycin resistance gene (which is the positive selection marker in ES cells ) was expressed profusely in the abnormally abundant cells generated in the GATA-1.05 mutant females .
 ( protein: GATA-1.05, None) , ( cell type: megakaryocytes, None) , ( cell type: Proerythroblasts, None) , ( cell type: ES cells, None) , ( DNA: neomycin resistance gene, 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:
 ( protein: GATA-1.05, None) , ( cell type: megakaryocytes, None) , ( cell type: Proerythroblasts, None) , ( cell type: ES cells, None) , ( DNA: neomycin resistance gene, None) 