3918
The orf2 gene product is a protein of 79 amino acids with characteristics similar to those of the Tat ( transactivator ) proteins of the ungulate lentiviruses .
 GENE: Tat; GENE: transactivator
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: Tat; GENE: transactivator