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Moreover , the second RCC1 - like motif located at the amino - terminus of p619 stimulates guanine nucleotide exchange on ARF1 and on members of the related Rab proteins , but not on other small GTP binding proteins such as Ran or R - Ras2 / TC21 .
 RCC1 - like motif, p619, ARF1, Rab proteins, small GTP binding proteins, Ran, R - Ras2, TC21
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RCC1 - like motif, p619, ARF1, Rab proteins, small GTP binding proteins, Ran, R - Ras2, TC21