9598
The number of bound retinol molecules per protein ( n ) was 1 . 5 ( +/- 0 . 1 ) for alpha - casein and 1 . 0 ( +/- 0 . 1 ) for beta - casein , while 1 molecule of retinoic acid was bound in the alpha - and beta - casein complexes .
 Chemical: retinol; Chemical: retinoic acid
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: retinoic acid