2281
Oncogenic signalling by E2F1 has recently been linked to stabilization and activation of the tumour suppressor p53 ( refs 1 , 3 , 4 ) .
 GENE: E2F1; GENE: p53
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: E2F1; GENE: p53