11880
We have developed a novel assay to monitor the active, GTP-bound form of Rap1 based on the differential affinity of Rap1GTP and Rap1GDP for the Rap binding domain of RalGDS ( RBD ).
 Rap1GTP, RalGDS, GTP-bound form, RBD, Rap1, Rap1GDP, Rap binding domain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Rap1GTP, RalGDS, GTP-bound form, RBD, Rap1, Rap1GDP, Rap binding domain