4843
Human parvovirus B19 gene expression from the viral p6 promoter ( B19p6 ) is restricted to primary human hematopoietic cells undergoing erythroid differentiation .
 GENE: Human parvovirus B19 gene; GENE: viral p6 promoter; GENE: B19p6
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: Human parvovirus B19 gene; GENE: viral p6 promoter; GENE: B19p6