1520
This sequence is well conserved in various HIV-1 isolates and partial homology was found with the promoter region of the human retinoblastoma gene .
 DNA: promoter region; DNA: human retinoblastoma gene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: promoter region; DNA: human retinoblastoma gene