13048
Rbp1 ( - / - ) mammary tissue has epithelial hyperplasia , stromal hypercellularity , increased collagen , and increased oxidative stress characteristic of atRA deficiency and early tissue dysfunction that precedes tumor formation .
 Chemical: atRA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: atRA