1958
HRBC and LPS indeed stimulated the maternal immune system as revealed by specific anti- HRBC antibody production and enhanced IL-1 beta mRNA expression in splenocytes , respectively.
 ( cell type: splenocytes, None) , ( cell type: HRBC, None) , ( cell type: HRBC, None) , ( protein: anti- HRBC antibody, 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: splenocytes, None) , ( cell type: HRBC, None) , ( cell type: HRBC, None) , ( protein: anti- HRBC antibody, None) 