2463
For this interaction , the C - terminal part of Sp1 and the N terminus of E2F1 , a domain also present in E2F2 and E2F3 but absent in E2F4 and E2F5 , were essential .
 GENE: Sp1; GENE: E2F1; GENE: E2F2; GENE: E2F3; GENE: E2F4; GENE: E2F5
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Sp1; GENE: E2F1; GENE: E2F2; GENE: E2F3; GENE: E2F4; GENE: E2F5