7976
This protein , designated p532 based on its predicted molecular weight ( EMBO J 15 : 5738 , 1996 ) , contains multiple structural domains including two regions of seven internal repeats highly related to the cell cycle regulator RCC1 , a guanine nucleotide exchange factor for the small GTP - binding protein Ran , seven beta - repeat domains characteristic of the beta subunit of heterotrimeric G proteins , three putative SH3 binding sites , a putative leucine - zipper and a carboxy - terminal HECT domain characteristic of E3 ubiquitin - protein ligases .
 p532, RCC1, guanine nucleotide exchange factor, small GTP - binding protein, Ran, heterotrimeric G proteins, SH3 binding sites, carboxy - terminal HECT domain, E3 ubiquitin - protein ligases
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p532, RCC1, guanine nucleotide exchange factor, small GTP - binding protein, Ran, heterotrimeric G proteins, SH3 binding sites, carboxy - terminal HECT domain, E3 ubiquitin - protein ligases