922
When a longer - 714 to + 78 fragment of the PBGD promoter is used , the - 70 GATA mutant still displays erythroid - specific activity and is cis - activated by the 5 ' HS - 2 enhancer , while the - 100 CCACC mutant is completely inactive in the absence or in the presence of the 5 ' HS - 2 enhancer .
 GENE: PBGD promoter; GENE: 5 ' HS - 2 enhancer; GENE: 5 ' HS - 2 enhancer
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: PBGD promoter; GENE: 5 ' HS - 2 enhancer; GENE: 5 ' HS - 2 enhancer