13047
Mammary subcellular fractions isolated from Rbp1 ( - / - ) mice have altered retinol dehydrogenase / reductase ( Rdh ) enzyme activity that results in 24 - 42 % less atRA production .
 Chemical: retinol; 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: retinol; Chemical: atRA