3509
Using transgenic lines a detailed analysis of the Hoxa - 7 enhancer - directed expression during embryogenesis was performed . lacZ expression was first detected in the allantois at day 7 . 5 p . c . and in mesoderm and ectoderm at day 8 . 5 of gestation .
 GENE: Hoxa - 7; GENE: lacZ
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: Hoxa - 7; GENE: lacZ