1481
With this retrovirus , LMP1 was shown to stimulate the proliferation of primary mouse embryonic fibroblasts ( MEF cells ) .
 Anatomy: embryonic fibroblasts; Anatomy: MEF cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: embryonic fibroblasts, MEF cells 
Answer:
 Anatomy: embryonic fibroblasts; Anatomy: MEF cells