1281
This study analyzed how vitamin A deficiency affects the subunit composition of collagen IV and laminin of lung basement membranes and pulmonary matrix metalloproteinase content , plus the recovering effect of all - trans - retinoic acid .
 Chemical: vitamin A; Chemical: all - trans - retinoic acid
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: vitamin A, all - trans - retinoic acid 
Answer:
 Chemical: vitamin A; Chemical: all - trans - retinoic acid